You're reading a lot into two words there. And someone probably has said "um, what?" to you in the real world; but you wouldn't notice because it is a common pattern of speech.
The internet will be a remarkably combative place if that is the standard you set for when someone calls you stupid - it'd be a lot better to only read that into a statement if it actually gets explicitly said.
The internet will be a remarkably combative place if that is the standard you set for when someone calls you stupid - it'd be a lot better to only read that into a statement if it actually gets explicitly said.