More from the same source:
Rather than anxiously waving your hand around and wondering if you’ll be called on, if you would like to participate, signal to me in some way (a gesture, a dance move, a traditional hand-in-the-air, meaningful eye contact, etc.) and I will add you to the list.
Yeah, a dance move. Because all non-white students are into dancing. Maybe they can also bounce their basketballs because they must all be into athletics, too.