Well, I live in the bible belt, and I'm pretty certain it was discrimination in my case because one of their "board of directors" posted a homophobic tweet the same day I was banned. It's an example of how we shouldn't mandate hosting any "special interest" groups using tax dollars, which was the GP's point.

I was not challenging the sole purpose of the group as in your example, they simply retaliated for personal reasons irrelevant to the group's purpose, which is unprofessional. The group is about software development, not my hometown. The only reason I was even talking to their admins in DM is because they were harassing me with confrontational dialogue over a tasteful joke that went over their heads. It's a toxic group, and our public university shouldn't be hosting their events.