Some grovelling weasels are nor even able to keep a good job in the West, then they go to China to work for a crappy training centre and will call themselves "teacher".
They are losers, nothing else!

If these losers go to work in a crappy training centre, they should call themselves instructors, so I agree with you. I suspect you mean English Learning Centre though.

To be generous, shouln't we say that although they never managed to hold down a job in the west their one saving grace and redemption was in coming to China to work at any centre good or bad?