I wonder if that was all that was in the bucket? Due to the nature of filtration by kidneys, urine is actually sterile when freshly produced. If something else was in the bucket, or if it had been left out for a long time, all bets are off about sterility.
This is why it doesn't pay to piss off your woman. They don't shoot you. That's too quick. Instead, they do things to not only hurt you but insult you, too, and they like to prolong the agony.