I hate to hear the bolded parts of your post from anyone. A neutral tag might mean nothing to you, it means alot on the profile of a newbie, especially when it is not true. That little neutral tag could hinder Op's growth to an extent. So, when a matter of such arise, take your time and visit the victims page and voice your own opinion. If the majority of the forum says OP is an AI spammer, it's justified, others, you ask Free market to remove the neutral tag.
This was the first thought when I read that the neutral tag should not be paid attention to. The person who wrote it rarely visits the "reputation" section

? Neutral tags can be very different.
Likewise, if I were the person who left this neutral tag, I would not be so categorical. I do not agree with the first post that it was written by AI. Just check on other sites, such as
https://quillbot.com/ai-content-detector or
https://www.scribbr.com/ai-detector/. The check was done on only two sites, which is not enough. After 2 posts, I am not sure that it is necessary to leave tags about the person being an AI spammer.
Besides, this topic should also be in the reputation section.