C'mon guys, this is a grad student TA, likely dealing with his/her first semester. Of course it's difficult to deal
. . .
OP, you've gotten good advice here. Don't be too upset, even though I agree that this semester is "lost" for you. The good news is, the semester is almost over. More good news: with experience this disrespectful stuff becomes easier to deal with.
Agreed. Mooged, we speak from experience. Anyone who can't think of a classroom situation they could have handled better isn't being reflective enough.
Good luck. For now, focus on the students who are paying attention.