There's another aspect too: mysterious third-party echo chambers deciding what's now offensive. The black/whitelist thing is a good example; very often the topic is introduced as if the issue is resolved "we got together and had a discussion, and yes it is offensive" and suddenly everyone not present in that conversation has to accept this verdict.

Other times, you get the "well it's so very easy to make this small change, it's practically rude (or suspicious) not to" - a completely wrong sentiment for many reasons, but easy to make you look difficult for arguing about.