Eugenics. Specifically phrenology/craniology. Check 'em out. We know it as pseudoscience, but plenty of idiots out there still see "measuring tool" and think "it science", while supporting their beliefs they're a superior race, so it actualy lingers on drenched in irony.
"Them" who? Because I'm Jewish and it sure as fuck doesn't bounce right off me.
Maybe you live a life of privilege and aren't aware, but when someone attacks you for something about yourself that you cannot change and didn't choose, it doesn't feel great.