I’ve been on the Fediverse for years and I’ve never much encountered this. I curate my timelines very carefully. I don’t look at the Local or Federated timelines in Mastodon, Pixelfed, or Lemmy.
That said, I do the exact same thing with all social media. I don’t go to the subreddits that would have such content, don’t follow users on Twitter who spew this content, etc.
I’m not disputing that it’s there, because of course it is. But it’s also there on every other social media platform, and with far more resources these platforms haven’t been able to do nearly anything about it.
I don’t know what the answer is to this propaganda, and I want to make clear that I think it’s awful. But it’s the fault of social media writ large, not the Fediverse.
In fact, I’ve found the Fediverse to be better about calling it out and encouraging defederating offending instances than I’ve seen on traditional social media, which seems to shrug its shoulders at it at best and actively encourages it at worst.