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I'd say he's being really blonde to say something so blonde in front of his students. Someone so blonde should not be teaching our children!!

BTW: I was just kidding. Most true blondes are very intelligent......me for instance. He should be reprimanded. He wouldn't say those things about another race would he???

Its a stereotype, which is the founding belief of most racists and sexists.

Racists stereotype anyone outside of the race as inferior even though the person is usually smarter and more socially inept.

Sexists stereotype the other sex as being incapable of doing the same things or being inferior.

Stereotypes are a fact of life. Everyone makes assumptions about people based on their color, sex, and or clothes. What we do with those assumptions is what sets us apart, because most assumptions are wrong.

a blonde being called dumb just isn't fair

I'd be a little offended. Tell her to get a life, then tell the principal.