As for which schools have these workshops, I hope most do!
While I don’t know exactly what happened in the OP’s workshop, facilitated discussions to get people from different backgrounds to talk are good things. The point is to listen! But if nobody speaks, there’s nothing to hear.
This is one of those situations in which there are many truths. We need forums to hear them and try to understand them, not debate them.
Diversity efforts fall short if they are simply about getting different kinds of kids on campus. There is much more richness is they can learn from each other. In many cases, what has come out of these exercises has benefited everyone. For example, at several schools who heard that kids with less money frequently could not afford events on campus, a “student activity fee” was added to every student’s bill (and included in FA need calculations ) so that all on campus programming could be free for everyone. This worked better for everyone. Students attended more events (including ones they weren’t sure they’d like ) and community life was more vibrant.