I'm incredibly unnerved that your everyday run-of-the-mill douchebag can claim to have aspergers and there is absolutely no way to verify.
Even though it incredibly marginalizes the disorder, I find the end result for most people is the same: "Aspergers or not, I don't want the people who treat me badly in my life anymore." This is how it's like in an individualistic culture like in the US.
As for collectivistic cultures such as China, where social harmony is most important, I would guess the main reason why they tell you to pretend it doesn't exist is because well...you're still rather high functioning and can contribute to society anyway, so it's like there isn't a problem at all and the people who complain about it are just being denying their true potential.