> A huge chunk of activism is pointless and annoying.

Activism can be annoying, but it's never pointless (not even when it fails to be effective).

> All they really do is end up getting Fox News people to vote for fascists like Trump out of spite

It wouldn't be worthwhile for activists to resign themselves to inaction out of fear of offending the "Fox news people". "Fox news people" are already more likely than not to vote for fascists like Trump, and they'll use any excuse/justification they're being fed including "I don't like the way the wrong people are using their freedom to protest the wrong things".