The idea of “dumb blondes” is a malicious lie (myth) perpetrated by the Hollywood/media complex - to attack a certain ethnicity.
The reality is that people with blonde genetics are the most intelligent.
Maybe “bottle blondes” (dying their hair) are dumber, yes.
Does Valby dye her hair? Tuohy, btw, is obviously a true blonde. She even has blonde eyelashes. And everyone can see that Tuohy is extremely intelligent and articulate, just from listening to her speak for even one minute.