With the disclaimer that there's no excuse for intentional rudeness and that this isn't directed to anyone I know, I'm confused by people who choose to present themselves in a non-conformist way (lots of tattoos and/or piercings, biker-ish, gangster-ish, unusual hair colors or styles, etc.) being surprised when people prejudge them based on their appearance.
Wasn't it your intention for people to see you as a rebel/non-conformist/gangster, etc.?
I'm not saying it's okay that anyone prejudge another person. I'm just saying that sometimes people are reacting to the image that is intentionally presented...by you.