Depends on how you define "patzer". There are acknowledged levels below master in some of the systems, as I understand it. "Patzer" to some folks might just mean anyone who is not a challenge to them.
At a minimum, I think it's just someone who has learned to stop leaving pieces hanging, not step into mate, notices mates-in-two, doesn't go for the "bait" left hanging on purpose, etc. In other words, someone you actually have to play chess against as opposed to trying to fool them with cheap tricks and traps.
That's probably a good definition really. It isn't so much about being master as about not fumble and botching it at the board. I don't recall who it was that said, "I want you to be good enough so that I can beat you." A patzer is someone who isn't good enough to enjoy beating.
ok forget it, you win. every 2200 patzer is now not a patzer anymore. I get it. we can all agree they are non patzers.