I’d be pissed as well.
Me too...
I agree with you. The clerk has no manners and should apologize at the very least. It is a matter of decency not politics. If I acted that way with a client, I’d expect to get written up or fired. Maybe if she was being a jerk (and it would be within her rights to be angry at getting short-changed), there might be a mitigating circumstance, but absent that, the clerk is the A-hole here.