[QUOTE=GarthB]Your are probably correct, and that's a pity.
QUOTE]
I believe either You're or you are would have been appropriate here.
I think it is funny that you speak of ignorance but are ignorant of the fact that pointing someones errors out in front of many other people, and doing so in such a mannor as to be making fun of them is actually quite Rude. It is as socially unacceptable as improper spelling and grammer, if not more so.
End of rant.