The way the Fediverse is designed you need to actively seek out content. It's not going to be all that easy being a troll from threads attacking content on the Fediverse.

What I could imagine is that bigots might seek out LGTBQIA+ hashtags (along with hashtags related to other culture war dimensions), and find content from the Fediverse that way,

Then again, if that proves to be a problem, sites like Blahaj will probably be pretty darn quick to defederate. And this type of content, even when posted by kbin or Lemmy.world users or whatever, will probably often take place in communities hosted by instances like blahaj. So the thread trolls would find themselves isolated from the discussion pretty fast.

On the other hand, there's a bunch of queer people who use threads. If all servers immediately defederate from it, these people will never get to have a glimpse into the fediverse. They could benefit a lot from joining a different platform, but if we focus only on the bigots we'll end up never reaching them.

The same logic of course applies to other communities affected by the anti woke culture war bullshit, I'm just too lazy to come up with a more original example. :)