Well obviously the same. It's like jew goals. You don't act all polite on fifa, because you don't know opponents won't do the same back to you. I don't score jew goals against mates. I find it funny the thought of a pissed off user the other end. Timewasting at the end usually gets some creative replies. Is quite funny aha.
If the opponent goes it's his fault, not yours. He has to expect to lose as it's his fault for going.
I remember my opponent left the game at 23 minutes before. I didn't score until the 70th minute and eventually won 2-0. I found it harder than usual to play against no one there. Was odd.