I operate light rail trains in the Salt Lake Valley and transport a good many Asian tourists; and while they do take lots of pictures and videos, they are extremely polite, well behaved individuals.
I’ve encountered tourists from Asian countries who were very pushy about getting photos, obsessed with it to the point of breaking lines and shoving people out of the way. It sort of went against the grain of what I knew about their being polite people in general. All bets are off when you’re on a mission to get mementos of a trip to Disneyworld, I guess. Didn’t see spitting, just pushy and rude.