>In the academy, left-wing beliefs dominate; therefore, the affirmative action supporters would be first and foremost demanding preferences for conservatives, libertarians, moderates, fascists, monarchists, and other people who do not accept the current progressive orthodoxy.

This is simply being obtuse for the sake of flame-bating, caring about diversity is simply a shorthand for the inclusion of sectors that were and are (actually) prejudiced against. The actual "practical" usefulness of diversity is more "perhaps we should try this facial recognition software with black skin", not the PR-esque "being different is superpower".

And no, you aren't a prejudiced because you are conservative, not even when people disagree with you on Twitter. Yes, Twitter mobs are actually a thing, yes they are dangerous, no they aren't that common. It's true that American liberals are overly interested in racial injustice to the detriment of class injustice, and affirmative action could be better based on socio-economic status.