All of them are. Even my boyfriend is, he recently asked if "Hot N Cold" was a Pink or Kelly Clarkson song. And then said they're all the same when I told him it was Katy.
But I see what you're getting at, OP, and the answer is yeah. At least for the most part. Barely any of my IRL friends care about pop stars or even about pop culture in general. I sometimes wish more of them were more interested in it all because I'm so into it myself.
All of them are. Even my boyfriend is, he recently asked if "Hot N Cold" was a Pink or Kelly Clarkson song. And then said they're all the same when I told him it was Katy.