If they are old enough and give consent, he's really only being a naughty boy, but not a criminal. If you have never been naughty before, you are either boring or lying.

To be honest, calling someone a nonce seems to be the standard go to insult for anybody wishing to discredit a teacher and I struggle to take such accusations on forums seriously. It sounds like Silverboy has never actually done anything wrong, but some people like to twist a story or two.

A lot of the holier than thou people are probably hiding secrets themselves anyway as others have said.