But reality says that beauty is correlated with fitness, which is correlated with intelligence. Beautiful people should tend to be smart. I think there is some positive beauty/intelligence correlation.

"is correlated with" is not transitive, the conclusion is true, but it doesn't follow from the premises.

I guess this is exactly the sort of comment that the original post was supposed to be warning people against making - does the fact that I've noticed this, and am pointing it out here in apology help to mitigate it?