I don't think you can compare a premeditated act of peeing in the kitchen bin to being sick on the floor when drunk. Would you prefer if she choked on her vomit?
What sort of person is Sandy that he could do something like that? It's repulsive.
As Kaz said, why wasn't the bin removed & replaced or disinfected? They should have ordered the housemates into a room and cleaned up. It's so unhygenic - that made me feel really sick. I wonder what his wife thinks about it?