She says that Obama was bad. Everyone understands she was being sarcastic. Since she was being sarcastic it means that she is trying to say that Obama wasn't bad (because that's how sarcasm works).
rmb¥.50元 yuan
I think you mean rmb人民币$圆0.50yuan½零，五零元%¥renminbi.
https://www.youtube.com/watch?v=TrryML0XVuY
She says that Obama was bad. Everyone understands she was being sarcastic. Since she was being sarcastic it means that she is trying to say that Obama wasn't bad (because that's how sarcasm works).