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 
Here you can generally assume people will engage with intellectual honesty and intellectual curiosity, not just to "win" an argument but to have a real exchange of ideas that results in potentially both people benefiting. Everything isn't a debate and every conversation does not have a winner and a loser, the goal everyone has here is generally for everyone to be better off.