East coast, so maybe different culture from California. It was also a few years ago and the culture might have shifted a bit since then.

I was literally in a seminar where participation was encouraged and part of our grade, and my professor stopped calling on my because I raised my hand for nearly every question. Even though I would often wait for a few other students to speak before I raised my hand. And sometimes no one else would raise their hand at all. Prof was basically pulling teeth to get anyone else to respond, and my arm was getting tired from staying up so long, and this was a regular occurrence.

But he docked me participation points because one day I was getting really frustrated and fed up with being so blatantly disrespected, so I decided to leave instead of making a scene. My blood was literally boiling and there was no productive outcome that could have resulted from me staying that day.

The result was that I got docked participation points from a seminar because I raised my hand too much. If that's ever happened to someone who isn't a cishetero-presenting white male, I'll eat my shoes.