Provided your not his partner, and you wait in the lobby until time runs out, your percentage will not be affected.
I take a mental note of players like this, and if I am the host, they get booted, if not I leave. It is just a game and I like playing AS as its a sociable and fun game, win or lose I enjoy 99% of the time. The one percent of the time is when you have people like you had, and are usually are dicks all the way through, makes me laugh when they scarper last hole, a sense of satisfaction.