What happens to a "white" person who feels deeply uncomfortable sharing a bathroom with a "black" person, or vice versa?
What happens to a heterosexual person who feels deeply uncomfortable sharing a bathroom with a homosexual person, or vice versa?
A couple of real-world examples that are or were very common in various places. I'm sure there were some deeply discomforted people shortly after racial desegregation in the USA or South Africa, for example, and neither was a long time ago.
What happens when a woman is not comfortable sharing a bathroom with a man, or vice versa?