Greetings!
Well, I don't "Dress Up" or wear costumes when I DM a game. Sometimes, I wear my Viking Horned Helmet, or my rubber SHARK Head. As for "leaning into stereotypes" I also do that, constantly. I ham it up completely, whether depicting someone from an African-like background, Asian, Indian, Norse Viking, Desert Nomad, whatever.
I also play with the stereotypes of every kind of white person, ever. Fat, greedy Roman merchants, whore strumpets, bearded rogues, crazy demagogues. The list is endless. Snooty, smug Britons! Smooth Frenchmen, elegant Spaniards.
Players fucking LOVE IT--and are often inspired to roleplay more, with more enthusiasm, and more effort. It's all FUN.
Oh yeah. My black friends and Latino friends? They ham up the fucking stereotypes too. Everyone, every culture, is open game. Noone is fucking special or sacred.
That is the way it should be, for everyone, at every table. Don't let the mentally damaged, the pussies, and the Racist Liberal crybabies try and change gaming.
Semper Fidelis,
SHARK