I don't understand it at all! I can do some of those things, and I'm on a sports team at school. It isn't gentlemanly to cheat, so I don't. If someone suspected me of it, I'd give them my word of honour that I hadn't cheated. It's wrong not to trust someone's word. They're calling your friend a liar and a cheat with no proof at all, just because she's better than them.