It's not the looks that matter, more the level of sophistication when they open their mouth and what behaviour they choose to display. Hitler was an intelligent man, even if I disagreed with his agenda. You not so much. Behaviour wise, you could be an A+ school student but if you do something stupid like running across train tracks or riding a bike at night without high visibility gear you're an idiot.
With regards to race if you took IQ/academic results you would find a general pattern of Asians > White people > minority groups. That's not because they're less intelligent, perhaps certain cultures don't value what the IQ test and school caters to, or they are at a disadvantage at performing to their full potential. It's an inaccurate as hell system, if there are others I'd like to hear about them. None of us are born equal but I wonder if some humans just have a little candle burning up there compared to the mighty bonfires of some folks.
Today I saw two girls that were definitely younger than me in rather revealing clothes pushing a stroller. Based on their attractive appearance, language and situation (having a child far too young) I thought they must be idiots. Bimbos with more beauty than brains. It happens a lot in my district, we are notorious for having a toxic culture with no family values, parents on the dole not giving two ♥♥♥♥s about what their kids are up to. It's pretty moronic, you can blame poor choices on lack of opportunity, social inequality, poor parenting, all of that stuff, still I think intelligence must come into play somewhere when you see something dumb.