One must be careful. This can be a grey area. The characteristics here mentioned are typical of the QP, and grey is usually their (natural) hair color. I understand that they can be bribed with fat quarters, but I wouldn't waste my time or fabric. The reason I issue caution, is that there are genuinely concerned people who will scrutinize our works and provide helpful comments or suggestions. You should ask for feed back. If someone makes comments about mismatched points, that may be a quilt police. If you ask, "How do I avoid these mismatched points?" then everyone who answers is a mentor. (Before you asked, they were making comments on the pretty color combo.)
Recently, I was picking the brain of a fellow guild member about the overall operation of the retreats, shows, fund-raisers, etc. New to this guild, it seems so different than the other groups to which I've belonged. I was advised to hang my quilts for show, rather than for judging, at our upcoming guild show. She described the judges as unemotional nit-pickers who don't know how to have fun. So, yes, we have plain clothes quilt police in my area.