Never ignored anybody and never will. That's what the scroll function is for. I reported low-key once (and mentioned it publicly to him on a thread) when he put a graphically semi-nude pin-up girl picture in his signature. It was inappropriate and nobody but him would have ever even thought to post anything like it. It disappeared right away and I'm sure no other consequences were dealt out.
I've never reported anybody else, even those who have come for me in PM. It's easy enough to just ignore and literally none of them persist when I don't respond in any way.