Why do people who dye their hair blonde suddenly think it makes them a blonde?

And I'm talking about the stereotype that blondes are a bit ditzy and slow lolšŸ˜‚

I've heard a lot of brunette girls with their hair dyed blonde say or do something stupid and then blame it on being "blonde".

How I see it, being "blonde" in the stereotypical sense is something that comes genetically with naturally blonde hair. If you're a brunette or any other hair color and you dye your hair blonde, that doesn't make you a blonde.

Correct me if I'm wrong.

Why do people who dye their hair blonde suddenly think it makes them a blonde?
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