In my experience, the most vicious and toxic treat defenders (many of which tend to be carnists that show themselves for carnist reasons) are the ones that react to posts that, for just a moment, make them possibly feel a brief pang of guilt and they need aggressively re-bury that unearthed guilt so they feel like the Main Character that can do no wrong and has to make no efforts to cease doing the thing that they briefly felt guilty about.