Brigading isn't a real thing mother fucker. Some people agree with a thing and share it because they like it, other people disagree with a thing and share it because they dislike it.
Labelling the latter "brigading" because you don't want people showing up and disagreeing is fucking nonsense. It was nonsense on reddit where the admins basically determined that they don't want community bubbles to be disrupted by disagreement and it's nonsense here too.