I had a woman do that to me once when I was a bartender, I was trying to cool down a couple who were fighting. She spat in my face and I threw up on her. Granted, I’d been fighting a stomach bug all day, and was already queasy from the smell of stale **** and bad food in the bar, so I doubt it was simply a visceral reaction, but I also doubt that she ever spit on someone after that! She was really surprised! As was I.