* I hope no one thinks I'm trying to trivialize blackface which was, of course, far worse than what Big Bang Theory is doing.
I was hoping to not have this debate that invariably comes up about how you can't compare anything to blackface because of how bad blackface was but I don't consider that a valid argument against the comparison.
Try replacing nerds with black people in that paragraph and tell me it's at all comparable.
Kids are cruel, but their social order is not the real world. In the real world nerds are not a disadvantaged, let alone oppressed, group.
BBT is not at all empowering the way that "Weird Science," for example, was, and highly-mainstream TV executive Chuck Lorre is of exactly a more powerful class who has allowed nerds to enter into a world where they were previously excluded. That BBT is only slighly less-awful than how nerds were previously portrayed is not a badge of honor.
How often does the show demonstrate dignified interactions between its main characters and the outside world?
I'm not at all saying "you can't compare anything to blackface." There are absolutely modern power structures that resemble it, and it is absolutely right to point them out and deal with them. I would never ever say that you shouldn't.
What I'm saying is that this is not a matter of scope but structure. Structurally, whatever you're seeing in Big Bang Theory does not resemble in any way what exists in traditional minstrelry. The people who are the butt of the joke in Big Bang Theory do not suffer systemic disadvantages in the way that Black people in the Jim Crowe era did, and they actually enjoy quite a lot of systemic advantages.
If merely caricaturing people for an audience to laugh at is sufficient justification for a comparison to minstrelry, then the entire comedy industry is and has always been guilty of it. As for unpopular, I'd also argue that there's a vast difference between unpopular and being treated as subhuman by law, to the point that they are not even close to the same thing. Black people being 'unpopular' is not why minstrelry was wrong.
For example, "my teacher is a Nazi" does not make anyone think Nazis are only as bad as teachers, only that the student is overreacting (comparing the teacher to something that is on another level, i.e., worse.) The inverse, "Nazis were basically strict teachers," is a horrible thing to say as it brings Nazis down to the level of something benign.
To say The Big Bang Theory is blackface does not make a person wonder if blacks were actually only mistreated as much as nerds. It makes a person wonder if nerds are systemically exploited and mocked by social superiors. The answer is that in a very limited way, this happens, but it happens in an extremely irrelevant part of life (school) and nerds go on to run the world and are unquestionably full equals, possibly superiors, of more athletic people socially and politically. At no point here do we think blacks are only as mistreated as nerds.
On the other hand, saying something like "being black before the Civil Rights movement was like being the nerd in high school" is obviously offensive because we are bringing the black experience to the level of the analogy, being a nerd, and then making the comparison, and it's not even close.