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 
Brigading is a bullshit Redditism. For everywhere else, they're called raids and raids are a reality of Internet life. Even Twitter has a daily main character where people dogpile on someone with a particularly shitty take. If you don't want to deal with raids, you can always join the winning team.