I have recently made 3 new friends at the gym and they’re all lovely when we’re together but I can’t help feeling like there’s a red flag. When Friends A and B are together they’re mocking/slagging off C, when it’s A and C they’re doing the same to B, and the same when it’s B and C to A. They’ve known each other for years apparently but they say some mean things about each other. I’m not very good at making friends and don’t have many so I don’t have much experience but my gut is telling me they’re not good friends. Is this common?