This has been my experience. I used to help moderate a forum, and never had any issue at all banning people for posting racist stuff up until 2016. Then people started calling that "political" and insisted I was biased against conservatives after I banned someone (who happened to be of a certain political affiliation) for making a thread full of just "fuck muslims". It caused drama and I left. People are overly primed for the narrative that conservatives are irrationally oppressed online and they ignore details to make it fit.

* behaves like a xenophobic asshole online *

* experiences backlash, gets banned *

"Help, that's unfair! The left is censoring me!!"

Astonishing how many times I've seen this exact situation play out. Reminds me of kids doing a bad thing and then crying and shifting blame when they get caught.