The Mudcat is a lot easier on the eyes than that site Harry linked us to. Much easier to read it and get around it.
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"Irtrad" - that's a new one on me. Never heard it, and I'll certainly never say it. Sounds like a variant on Irn-Bru, that Scottish reprisal to Coca Cola.
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I'm all for proliferation of music, and specialist venues and sessions can be an important part of that - but no time for people who see this as an occasion for hostility to those who approach things differently from themselves.
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And no, I can't see Martin Carthy going "Because you're not good enough, is why!" He'd see it as important to deal with it in a way that would send the fella away resolved to practice until he was good enough, not humiliated and maybe alienated for good from folk music.