Yeah, if only it was that easy... Arrogance has been an issue at all levels for a very long time, and I don't see it changing.
That's true, that's why I disable the chat in all of my live games LOL. In any case not letting it affect you or how you speak to them is the best thing to do
"The most important quality in a chess community is to be nice."
I agree. We should use the nice features on this site. We should move the nice pieces to and fro. We should give nice annotations. How nice.
Whilst that would be ideal, it's entirely possible that he doesn't have the time. Or maybe simply doesn't want to do all of that. And that's perfectly fine. In which case the best thing to do is to conduct your own research and find out if what he said is true or false - and regardless of who's correct, you're bound to learn more things!