>>348980010
if someone told me "I'm going to a private event and I'd prefer if you didn't join on me during the event because you're not part of this group and they don't like outsiders" I wouldn't be offended, I'd be more like "ok, how can I distinguish when you're in the event or not so that I know when not to join?"
if someone actually gets offended from that they have some serious mental issues

of course it depends on how you phrase it too. if you just say "hey man I'm going to hang out with my friends and I don't want to see you there so don't join on me", honestly you're just being a prick and I wouldn't be surprised if that person unfriends you right there and then

say things in a way that makes sense and doesn't hide details, don't make it sound like something different than what it really is. and if the person gets offended after hearing the truth, honestly, you probably don't want them on your friends list anyway and you'll fall apart sooner or later anyway, might as well do it now than later