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I think that's a bit of a cliché, due to the history of working class riders during the golden age of ciclismo and the Belgian farmer riders like De Lie.
you have riders that come from athlete or cycling families. your Poulidor-Van der Poels, your Teutenbergs. can't tell how intelligent they are.
the rest is more middle class, where parents can afford nice bikes and are part of the local cycling clubs. then you have your accomplished philosophers and member of the order of the arts and letters of France Guillaume Martin-Guyonnet.
for the femmes that certainly isn't true at all. you have your math phd olympic winner, reusser and chabbey are both medical doctors, bredewold might look retarded, but she wrote her thesis. have more such cases of already academic or professional accomplished girls, that need cycling as additional outlet to channel their excess energy.