Arantir, it be one thing it both people were in on the shit talking. I've seen characters do this and it's hilarious.
Unfortunately, it's entire one sided here and the one time he is actually enjoying himself and she isn't, she has to cut him down. And what makes it worst is that this has been an ongoing thing with her. With the guy, he just bites his lip and doesn't say anything. And when he does say something, he is either manipulated, gas-lit, and or coerced into saying HE'S at fault.
The reason why I love Nagatoro so much is that despite all the taunting she does, is that she respects the guys boundaries, and she knows what lines that cannot be crossed and she stays within those lines.