My comment is net -1 right now, and I don't believe I made any assumptions about the person I responded to in the feedback I tried to offer. If people don't think my feedback is useful, that's fine, but if I had started it off with something like "ah, the presumptuous teacher", I'm pretty sure it would be been received even worse.

I read the initial comment as asking a naive question, but I think that's great, as long as they are open to answers that contradict their assumptions. People should be able to do that and get earnest answers without backhanded comments. Asking naive questions is a big part of how I learn, personally.