Like some of the top-ranking comments here are saying, that place has a very large proportion of people who were coming from the banned subreddits like The Donald, various straight-up hate communities, and typical alt-right groups. So naturally, alternatives that were founded by anarchists and socialists (raddle, lemmy.ml) were almost always disregarded there, possibly with the exception of the Wolfballs admin (I can't remember too well if they got much attention with the 'they're not all like that' line)
It's always funny to me to see newer users complain about a lot of political (incl. FOSS) users in an inherently political project, which was picked by many precisely because its political values prevent the for-profit shittery that reddit.com has been doing for 15 years, and that alt-right social media alternatives frequently do whenever they get enough users. Yes, we're going to voice our concerns when people show up at the door and want this to be just like reddit was, or bring over the uncritical mainstream ignorance we came over here to avoid.
Honestly, brigading is still a valid thing that can exist here, but yes, people don't realize that if a post gets popular on a popular federated instance, people who appear like 'foreigners' (for lack of better word) will jump in and flood it. It looks as if a brigade, but it's entirely organic, non-malicious, unorganized and unprompted.
I'm not sure how to classify things like 'dunk tank' posts, where someone on an instance will say 'lol look how dumb this post over there is'... it's not really calling a raid but many people will go to the source comment and dogpile them. And sure, that's just part of being a public website, but it's a bit easier with federation to go over and interact, just like it is moving between subreddits on reddit.