I am way too cynical.
I don't think so, but you know yourself better.
You seem like a nice person, FP. You invited this guy (a distant relo, not someone too close) to your sister's wedding. You let it go that he didn't show up....but were looking forward to a congratulatory call. You seem to know the rules of courtesy better than your distant cousin. And you seem to have better manners and you seem to have a better awareness between right and wrong. So....drop the cynicism for a few minutes.....and use your many positive qualities for the polite education of this fool cousin of yours :)