Now that it's in the rules, I hope we also see less of "your comment was obviously AI generated so I won't respond" (ironically, in a response comment).

If you suspect it to be a bot, flag it and move on! If it is indeed a bot and you comment that it's a bot, it doesn't care! If it is not a bot and you call it a bot, you may have offended someone. If it's a human using AI, I don't think a comment will make them change their ways. In any case though, I think it's a useless comment.