@owlyph I think the key use case is a popular post with a lot of comments. Many of the responses will be bad -- mansplaining, hostile, etc. Without a dislike button, the original poster or another commenter has to reply to the post, explaining for the umpteenth time why mansplaining is unacceptable (or whatever). This puts the conversation into a he-said-she-said mode, where the OP has to argue for why the behaviour is wrong.