Yes, that's bad. I took a look at the scene after reading this. They were talking and joking quietly in bed. She was laughing a lot and seemed to think they were joking back and forth. He seemed to be joking too, at first. But, she took it too far. And you could tell he was bothered. Now, what she said was actually true. But she's not as self aware as she thinks she is if she didn't consider how bothered someone would be by those comments, particularly someone she was interested in.