And we shouldn't allow this concept to go unchallenged here on Lemmy.
Commenting on an active post is not brigading
Posting a link to something is not brigading
Commenting on something you were linked to is not brigading
The only thing that might be brigading, but isn't because it isn't a real thing, is someone explicitly going, "Hey everyone, go here and harass this person"
It's all fine and good that we have some new rules to keep the peace with other instances but we must fight against 
I don't know what the purpose is. I haven't really communicated with the "real world" on reddit in a couple of years now and seeing what the "real world" of reddit is like - shocking politic ignorance, bizarre faith in long since discredited and discarded propaganda, willfull ignorance mixing with genuine ignorance mixing with incuriousness, I don't know how we could possibly have a positive interaction with, frankly, redditors.
The problem is that everything is politics, and everything is specifically vicious, destructive liberal politics. It doesn't matter if it's bike infrastructure or treatment at work or the weather; It's all deeply entwined with politics and most of us on Hexbear are completely rabid political animals who've gotten really used to not letting lies and falsehoods go uncommented on. Fedditors are posting "normal" things without realizing how deeply those things are tied in to their liberal brainworms, then we... do our thing - That's not the case, this is what's really happening, fifty citations, here's why people think that, here's what we think is more accurate.... and they're calling us tankie bots again.
It's a lose lose.