What to do when someones mad at you?

There is really nothing you can do. Just avoid making them angry in the future. However, it seems kind of selfish to ask your uncle of that when you just met him. You should treat him more like a family member than an indirect contact to Britney. And to the addition of friends telling you he's fake, tell them to f u c k off and leave it at that. Don't reply to anything after that, and just know that HE is who he is; if they don't believe you, it's their own fault for being idiots.