How about if I ditch a friend at a networking event?
Can you tell me if this is for real? Why are you planning to ditch your friend?
I have no obligation to endure the pathetic company of a jerk
It seems that you may be embarrassed by the actions of your friend. You should speak with him about the things that you find unpleasant and how they affect your friendship. Helping your friend see the errors in his ways may help him to improve his mannerisms.
I'm going to ditch him.
Talking is more mature, and just ditching him with no answer might make him think you are the problem. At least let him know how much of a jerk is, maybe he can change?