I'm intrigued by stereotypes. Really it's just confirmation bias backed up by mainstream media.
Geeky nerds who like star wars and robots
Redheaded women having fiery tempers
Blondes being a bit thick
White people cant dance, black people can
Do stereotypes exist because our physical attributes contribute to our actions or do we play up to stereotypes because its how we've learnt 'we' are supposed and expected to behave. Or in OP's case do you rebel against what is expected of you and act the opposite.
I generally find a grain of truth in them but largely they are complete bollocks.
The shopkeeper in your scenario....maybe he gets robbed a few times by a black woman, he now stereotypes black women as thieves. He pays more attention to them and low and behold catches more black women stealing than white women. It's not to say WW aren't stealing, but they aren't being caught because he's now focusing on the black women.
Redhead in the next car over beeps her horn and shouts at you in traffic. Ah the fiery redhead, confirming the stereotype, but you don't think about all the meek and mild redheads you know.
I can't stand watching that Marlon sitcom on Netflix. It plays into every black stereotype there is with a little twist at the end where Marlon and his family inevitably learn some lesson or moral to set them on the right (white) road. Bloody awful programme. Surprised he hasn't been called out by black twitter for perpetuating shitty stereotypes tbh