Everyone in our family has some tendencies, I totally get you on the the pen thing. Im currently dealing with my partner playing a game behind me,,, tap tap tap tap OH my god for hours. I have to go to the woods…
Anyhow, In a class situation, I find simply speaking up and saying excuse me, I didnt catch what you said. to the Prof. If that doesnt stop it, ask a second time Im sorry, I didnt catch what you said over all the clicking. Once you call them on it it should stop. Its a professors responsibility to maintain a classroom that allows everyone to learn in. And hugs.