Revenge flagging is not a good idea. It will only make people angry. If you don't think my post is valuable then it is completely fine for you to downvote it. It's nothing personal, I downvote a lot of people who make useless comments. Yours looked to me like it was from a robot. If you don't have something to add to the discussion, it's best to just upvote the post and not comment. Hope this helps.