A brunette is a girl with brown hair. That is all that a brunette is, they are not necessarily smarter or prettier than blondes or redheads neither are they necessarily less clever or pretty than girls with different coloured hair. It's just genes or coincidence and learning is what makes you smarter. No Duh!
Bob: I'm going out with a blonde
Bill: I'm going out with a redhead
Ben: I'm going out with a brunette
Bob: Haha blondes are prettier than brunettes
Bill: Sure they are
Ben: Whatever, blondes are stupid!
Bill: What the hell are you on about it makes no difference
Leela: What's going on here?
Ben: Blondes are stupid aren't they?
Leela: No, I'm blonde and top of all my classes
Bob: Yeah but brunettes are prettier
Leela: No Have you not seen some brunettes compared to blondes/ redheads/ girls with black hair?