I was one of the people you permabanned for calling you out on it. Don't know if I still am. ID 687 if you want to take a look at it.
If they're AFK then why would they care if they got shot?
I don't think you've been banned for quite a time.
Also, most of the time, they're not AFK, they're just wrenching something, buying bricks, IRCing, talking with an actual person through the medium of speech, whatever the case may be. Being shot at is annoying as hell in all four of those cases.