I agree it's extremely rude. If he really had to go that bad he could have peed in a plastic cup. I've also disliked it when some guys do this, unless they're out in the middle of no where.

The other day I was coming out the front door at night and the teenage boy next door was getting out of car with his friends. One of his friends said "hey I'm gonna pee in the f'ing garden and he did. The neighbors next door are nice but I guess the son can't control his friend.