There are some truths, but I think not ALL pretty gals are
stupid or dumb. It all depends on what the MAIN pre-occupation of
these pretty gals are.
For example, if all a pretty girl does is tend to her looks and
shop for clothing, then she is likely to know nothing else about
the world she lives in besides beauty and fashion - and of course,
mobile phones.
Some pretty girls I knew, have got brains bright enough to give
mine a sun-burn.
It all boild down to pre-occupation and interest of a person, and
also UPBRINGING. How she was brought up by parents. (personally I
tend to hold the opinion that Mandarin educated ones are usually
dumber...)