Teaching about the common racist stereotypes[0] would help. Perhaps communicating that not assuming minorities belong in specific places can be demeaning, and it's best to be mindful of stereotypes when talking to minorities.

0: https://en.wikipedia.org/wiki/Stereotypes_of_groups_within_t...

To live in a society where no one bats an eye that a women is in a CS building.

That's not a solution.