I don't really give negative karma unless an account is a bot, but I tend to put anyone who posts repeated points, quotes the whole post but only responds to one point, or says low-quality things like "thank you" without further comments, usually end up in my ignore list. It's not like I won't see their posts again in the future, but I feel that they need to make more than one quality post to improve their image and get karma from me. It made me a bit biased if the first few posts that I see from a user are somewhat low-quality. Judging from some of the comments above, are people using AI that prevalent? I tend to find more spammers instead of AI posters.