I am really somewhat surprised to hear that honestly. After Lemmygrad.ml and hexbear.net, the worst extremes I see by far come from lemmy.ml. Sort of a “when I see trolling this bad, then >90% of the time it is lemmy.ml”.

After that, yeah, lemmy.world has the largest absolute number of trolls on the Fediverse - you kinda expect some from any large instance, and they are definitely the largest by a wide margin! According to lemmy.fediverse.observer/list, they have >5-fold active users than anyone else. I presume that’s monthly. The next largest instance, is lemmynsfw.com, followed by Lemm.ee, sh.itjust.works, lemmy.ml, etc. but each of those with 2-3k users compared to lemmy.world’s 17.2k. So the latter is bigger than many others (if not quite all of them) combined.

Trolls from lemmy.world I block individually, but lemmy.ml got so frustrating for me that I blocked the entire instance. I do not regret that in the slightest. It was that or quit Lemmy altogether. Lemmy.world though seems… “manageable”, i.e. not every person from it is worthwhile to talk to, but enough are that it’s worth blocking only the trolls while keeping the rest, imho.