Every belief, good or bad, has a lunatic fringe that takes that belief to some stupid extreme.
If we judge every belief by its most deluded lunatic fringe, then we would be forced to conclude that there are literally zero beliefs or ideas worth subscribing to. The lunatic fringe is always there, and it is always scary and/or really, really dumb.
Learn to recognize the fringe.
I think perhaps the importance of that depends on how... unified the group is, you know?
If there are 3 people at a dinner table and one of them is acting badly, definitely hold the other 2 accountable.
If there are 1,000,000 people in a political party and 1% of them are acting badly, I think the 99% and the leaders are somewhat responsible.
If there's a vague concept like "cultural appropriation" or "cringeworthiness" that isn't owned by anybody, I don't know how practical it is for people using the term to really have responsibility for people that misuse it.
At some point there's just a practical limit I think.
The idea there is a mass movement of people saying other people tan too much is beyond delusional.