@remial
I think, yes, since I can't remember a single time she apologized exactly for teasing him... But that was mean in a way, and Takagi never did anything to hurt Nishikata, so it's not that unimaginable. But she is being jealous here, for sure.
That last part is relatable. I find it very hard to read lines on what is too far with just teasing or joking around with friends versus being mean to them.