IT'S YOUR PERFUME. I've seen this many times. A foreigner or in this case a black person goes to China or East Asia, and they are greeted with covered noses and mouths. They think to themselves, I smell good, I applied perfume before leaving, why are they doing this? This must be racism. Chinese and East Asians do not have body odor, ~95% of us carry a variant in the ABCC11 gene causing us to produce no smell after sweating. You can't even find deodorants supermarkets in China, people just don't need it. So our sense of smell is not used to strong perfumes, and when you enter a confined space with your perfume, people literally find the smell stinging our noses.