I'm going to yell at a classmate for talking over the instructor
Is yelling at them a good idea?
The instructor doesn't care, there is another procedure in the class where she calls on people.
The classmate should not talk over the instructor, but you also should not yell at them. They can control the classroom themself.
Maybe, but there's lots of chatter in the class.
I understand you, but you would just be adding to the noise by yelling.