Well, yes, I've been on the receiving end of some of these situations -- and the more mature me isn't hurt by it. People don't have to like me or want to hang out with me. But when I was a younger, socially inept, desperate to please, lonely person I could feel quite hurt by being left out of social stuff.
KH events could be like this, too, invite everyone so no one gets hurt feelings, and the folks no one can stand will definitely show up. There's a reason we can't stand some of them -- they're obnoxious.