@cassidyclown @Humpleupagus @Xenophon you'll have to let your conscious be your guide.
We got married in an accelerated schedule to start trying for kids because of a murder/suicide that hit close to home. It was a destination wedding about 5 hours away and the only non-immediate family was my father's only sibling (because it was the only family wedding she got to attend) and our friend that was officiating. We had a small reception that day, but held a party for inviting everyone at our one year that would be reception caliber in scale. I had more than one uncle from my mother's side thank me for doing it that way because they hate wedding ceremonies. But that's my family and my situation.
You can send a message and be absent in protest, or attend and pull him aside and air your grievance. If one of my uncle's felt like you do, I would rather him tell me the same as you'd rather have had him tell you about the wedding. Two wrongs and that type.

I also made the joke that I didn't want to bother them if the marriage failed in the first year.