The fediverse isn't a unified whole. Some instances don't have moderation or have shitty inconsistent moderation. You should move to an instance like beehaw.org or lemmy.blahaj.zone if you want admins that don't put up with that shit. Both will ban users and other instances that do that allow that kind of shit. While lemmy.world seems fine with it, but if you call out their use of discord they may ban you.