Is this playful flirting?

My boyfriend’s friend is our age, and he’s been with his girlfriend for about a year now. I know my boyfriend hangs out with him occasionally, to watch football

games on tv, etc and the girlfriend is typically there. Now, the other day I saw her and she said hi but that was pretty much it, she was drinking and then was like being super loud and laughing towards my boyfriend and when they were getting up to leave she called him a bitch in front of me. Like “ you better go to our party next week bitch!!!” While smiling and laughing. This behavior isn’t normally within our group, since we typically don’t cuss at each other lol. Especially calling men a bitch. And My boyfriend looked at me all surprised and laughing saying omg did you hear her! And she left laughing and smiling so to me I took it as a playful flirting? She also just said “bye” to me and then did all that to my boyfriend lol. I don’t know but to me this was super weird and rubbed the wrong way. Now to me, personally I don’t feel comfortable with anyone acting like that towards my boyfriend, and calling them a bitch? I don’t know. It made me feel some type of way. Would you? I have to see her again next week, and I don’t know how I should act / react. Any advice welcome please 💞