Oh interesting. I was about to say that's not what banter means, because in my mind I always thought it's just a casual fun back and forth conversation not necessarily skirting that boundary of teasing. But then I checked the definition and teasing is a part of it. Every day you learn something new.

I think of banter as saying something offensive but not really meaning it so the humor is in being "playfully offensive" or "offensive when you don't really mean to be offensive"