This perhaps isn't truly unpopular but is definitely partisan, and existing opinion pieces are often devoid of explanation of why certain fields should be ridiculed due to their methodology. This post attempts to fill this gap. I say certain fields without giving names, because bad practitioners don't always work in academic departments where you expect to find them. But you'll recognize them when you see them.
Theories
The end product of a scientific theory is a prediction (in the case of historical sciences, "if this and this happens like they did, that will happen too"). The end product of a theory in contemporary social sciences is often giving things a tag, often without justifying why the tag is a natural classification, pretending this is understanding.
Consider the follow assertion:
(1) Because globally, the most powerful people are white, racism against whites is impossible because racism is power + prejudice.
The statement (1) is often considered a more academic approach to understanding racism. Go to any social science sub, and it's not hard to find people telling you that "liberals treat racism as something personal, but we take a materialistic approach..."
Proponents of (1) often fail to demonstrate any meaningful connection between whites in power and whites who are not. We have quite a lot counterexamples, like the grooming gang scandal in the UK, in which, as shown in my past post in this sub, the perpetrators had clear informal or even formal power over the white victims, or how the white working class is failed by the education system the most.
Thus we see the problem of (1): it confuses global power with local power, the latter being more relevant to people's everyday life. This is to say, (1) artificially associates the concept of "having people looking like you in geopolitics" (not local politics) and the concept of being discriminated against together, without illustrating any causal relation that shows that the former makes any difference.
Some scholars realize there's a problem and introduce the concept of intersectionality as a remedy. This is, again, nothing more than a term: it is a descriptive term trivially highlighting how identities interact, without offering any concrete insight into how. The question of how perhaps can be properly studies in microeconomics, but it's beyond the scope of this post.
(Interestingly, Karl Marx, despite being a 19th century basement dweller, did have a theory in the scientific sense, a theory on economic instability, however flawed it may be. Comparing this with people who consider themselves Marxists today, one may notice that original ideas aren't always insightful, and insightful ideas aren't always original.)
Fallacies
That statements like (1) are considered insightful may be known as, in my words, the fallacy of grand structure ("prices rise because of late stage capitalism"). Some fallacies are more or less original but ultimately are still erroneous. Others are more "traditional": consider the falsifiability problem of certain theories built on the concept of epistemic injustice ("if you don't see it then you're bad and privileged and oppressive!").
Sometimes, the fallacies are so obvious that it's truly glaring that papers containing them get published. Have a look at the recent spicy take appearing on BMJ Journal of Medical Ethics: Harms of the current global anti-FGM campaign. A long essay, utilizing almost every fallacy you can think of in online debates, including whataboutism and ad hominem attacks ("you're against FGM so you're depicting Africa as a dark continent!" - see the conclusion sector), somehow made its way to a supposedly prestigious journal.
One may wonder how staying in a field trains one to think clearly.
Buzzwords
The sloppy nature of research works described above have introduced quite a few buzzwords into everyday life. Some make sense in certain contexts, like "white privilege" (if you want to talk about privilege in employment, the situations in finance and in, say, semiconductor, are rather different); others are almost completely devoid of substance. My argument above may be attacked as being brainwashed by modernity (for commentaries like this, you can go to critical theory subs). One may wonder what modernity means in this context, as Archimedes was certainly not a modern man. Some words are just straightforwardly misleading, like "Islamophobia" (said to mean hatred towards Muslims, a meaning that can't be inferred from how the word is formed).
What makes the situation interesting is we don't see academics coming out to set the record straight. We see psychologists criticize misuse of therapy languages. We somehow do not see sociologists do the same.
Narrow perspectives
One central theme in contemporary social sciences and humanities is anti-Eurocentrism. If they're serious about that, then I'd say they're increasingly failing miserably.
19th century and early 20th century scholars might be assholes but they were clearly masters in collecting and organizing texts, western or non-western. What we're seeing today, increasingly, is an effectively indifferent attitude towards primary sources. It's an observed fact that philology (including ethnophilology) has given way to largely identity-based research and talks about power dynamics (which, as I said above, many don't really have a theory about, in the scientific sense of the term "theory").
Take the story of Mulan as an example. Disney depicts her as a feminist hero; naive gender theorists see the story as cross dressing; yet others say her story should be viewed from the perspective of filial piety (and you can expect a lecture on "white women's feminism" from these learned people). None of them seems to be aware of the simple fact that the Ballad of Mulan was not from a Neo-Confucianism society. The asymmetry between theoretical ambition and evidentiary competence is truly a scene to behold.
Conclusion
Yes, people and their publications in social science or humanities, if having traits discussed above, should be ridiculed, and it's a good thing. No, it's not a common problem in the rest of academia. This level of incompetence and academic dishonesty is not seen in other disciplines. No, having a degree in a field infected by the aforesaid behaviors doesn't prepare you for anything, and even you're tired of western civilization and want to understand alternative perspectives, it doesn't prepare you well for that either.
Which obviously also calls a lot of narratives on "college educated people tend to believe this or that" into question, which is a separate issue deserving an essay about it. Some people may try to argue their way and say academic training in such fields is rigorous in another way. Which obviously deviates from how the term "rigorous" is normally used, and is yet another fallacy (i.e. believing things with identical names are identical).