Ah, that makes more sense. But I'd still hold out hope that the writer might enjoy talking about teaching or about grammar but not talking about the sort of things they're complaining about. (And the reason it being rude to ask is not because it's bad to talk about the topic, but "asking for professional advice" for most professions NOT really talking about it, whereas "do you do X a lot", while perhaps overused, is still a reasonable conversation starter)
no subject