I'm not going to my friends house to go with him to a show that he was invited to
Why would you not want to go to the show?
I don't have a reason, I just dont want to go
It's understandable to not want to go to a social event. Your in your right to turn down going to any social event that you don't want to attend.
I only want to find a reason to be a dickhead, thsnk you for understanding.
It is understandable to not want to go to a trip.  There is not need to be rude and do something that could cost you a friendship.