I have a mean streak so I wear my shirt to class that says "I quilt because punching people is frowned upon". I am usually left alone and not distracted by anyone wanting to chit-chat.
Of course that mean streak has also led me to say to the instructor "I'm sorry can you repeat that? I could hear over the other talking" and shoot a look at the offender. But that was only in one instance when EVERYONE was irritated by the one wanting special attention. I actually had 2 people thank me after class for shushing her. Sorry but if I can find the time from a full time job and farm chores, pay my hard earned money to take a class, and you're going to be rude and inconsiderate, I am going to call you out on it. In a polite way, that is.