What are you going to do? You and I both know the inherent racism in the culture. Let's face it. Are your manager and his manager both HK? Then walk out or take it, because from the attitude he's giving you, he thinks of you as just another gweilo.
It was absolutely hilarious being shown off to my father in law's mates and business cronies. Baba is very open minded, and I have immense respect for him, but some of his buddies were absolutely seething that his daughter was marrying a whitey. All I did was smile and act exceedingly polite. This is the best way to deal with it. It is infuriating, yet since their hate has no justification there is nothing they can do if playing by the rules. If they want to play outside the rules, they will anyway and there is nothing you can do. So it's the best way.
Just deal with it. Retail in China is a shitty, shitty job to be in.
Oh and as Shadowlord posted, so true. In Beijing when using the urinals busted at least 10 dudes getting in more than just a sideways glance.