You're the exception rather than the rule.

Several months back when I wiped out on the way in, the bike was unrideable and I was bleeding badly from some major asphalt rash, I limped to a Metro station to try to get home. I went down the elevator with a Metro guy with blood running down my arm and dripping off my fingertips. Wearing shorts and had the knee skinned badly and bleeding down the leg. He never said a word. I stood on the platform, got on the train, then got on a bus to get where I was going.. NOT a soul said a thing.

Heck, if I had some disease I could have killed half a city with the body fluids I left behind.