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physics is a discipline that allows people who are confident with their intellectualism to stand out. I used to do exactly what that paragraph was describing, but only because I was the one in the group who actually knew what the fuck was going on.
If you don't want the advanced students to take over every group session, don't pair them with people who have a weak grasp of the subject matter.
And why is it white men? Probably because they knew about the expectations of a university setting coming in, and were predisposed to the kind of behavior that lets a person thrive in academia (i.e. speaking over others when you have something important to add).