Personally seems weird not a red flag but just odd. I wouldn't want to be called bitch because I'm not a girl I'm a guy. Also it's like her calling you buddy. Like I'm your buddy? No I'm the guy you want to fuck not your buddy. I dont think your over thinking . It's natural that you think it's odd. But you can set a boundary without being overdramatic, just tell her" I don't really like that", and honestly you don't have to have a reason. And if she complains and makes a big deal of it then that's is a big red flag. And another way to to make her stop is to joke about how weird it is that she does that.
