“Dumb Blonds”, sir, are brunettes who ad blonde or go blonde. True blondes are exceptionally intelligent! You have been schooled!
I never said that Ms. Costello was a ‘dumb blond’, now did I. That is YOUR inference from my comment.
FWIW, as a child, my hair was blonde. Now, it is a graying light brown. While attending university, beginning at age 38, my GPA was 3.73/4.