Como se llama "black flats" en espanol?
My Spanish teacher is kinda old age so he thought they were dance shoes. I kept saying they weren’t, but he didn’t hear me. So…yeah…how do you say "black flats" in Spanish?

Literally it would be ‘zapatos negros planos’ but it is not common to say like that in spanish. You can say ‘zapatos sin tacones’ (no heel shoes) or ‘zapatos con tacones bajos (low heel shoes).