I would have uninvited you too. Yeah, they're cultists and everything but they sent you an invitation to their aniversary party and wanted to know if you were coming. What the hell does the UN thing have to do with their 50th aniversary? What did you expect them to say? "Wow, you're so right about everything! To think, we were just wanting to invite you to celebrate our long marige with us and you shared this life altering information with us. Thank you. You are so kind. Please come share it with all of our guests at our party. In fact, it won't even be our aniversary party, it'll be a party to tell all of these people who care about us that the JW's were in the UN." If nothing else they probally uninvited you because they didn't want you to make a big scene at a very special party to celebrate something wonderful. Look, I hate the JW's as much as anyone else here but you're no better than a JW who would use this occasion to recruit more people.
Take a hint, its not that they really care what your were raising a comotion about, they just didn't want you to raise a comotion about anything. This was about their very special 50th aniversary. Their response was not a "typical JW mindset" (I'm not knocking that saying, I'm just arguing against it in this one case), it was a mindset that "We don't want this guy coming to our party that celebrates something very special to us and getting everyone upset about something that has absolutely nothing to do with this event."
Stop giving apostates a bad name.
Now I came down hard.
I don't need to fight
To prove I'm right
I don't need to be forgiven.