When a user has a -ive tag, I mostly read the feedback first before deciding to make a reply or quoting them. If they were tagged as a spammer or account farmer, I don't bother replying to them unless they mentioned something "quite interesting" which I highly doubt that it will happen as I expect that I won't even make an interesting conversation with them.
Lately for the ones with at least -2, I'd guess that they've joined 1xBit and most of my assumptions would be proven true
