They are putting into practice the main principle underlying "diversity" studies:
Whiteness is Racism. It is racist to celebrate, support, or approve of any white person, identity, culture, interest, or cause. It is equally racist not to celebrate, support, or approve of any non-white person, identity, culture, interest, or cause.
This is almost exactly what these people were saying. I said my piece and let them talk about how sensitive they are to others.