I don't think anyone considers wallflowers rude. Have you seen Beautiful Young Minds? There's a scene where one of the students learns he has made the next ro

I don't think anyone considers wallflowers rude. Have you seen Beautiful Young Minds? There's a scene where one of the students learns he has made the next round. The narrator says "congratulations". They chat a bit, and as the narrator is leaving he says, "congratulations" again, and the student in a dismissive way says, "You already said that". I think that's what most people see in introverts that is rude. Or when you say "Hi Tim" in the hall and he just looks away. Or if you ask "Can you pass the ketchup?" in the cafeteria and they say, "I prefer not to". All of these are probably very honest responses, yet I think I'd bucket them as rude.