Arguably more like trying to join a Honda club on your Harley, but OK.
Many if not most riders, drivers and yes, disc golfers, actually own more than one bike / car / disc, and usually from different manufacturers. Even my friends in the Alpha Romeo and Ferrari clubs actually own, drive, and enjoy other vehicles. And while their friends in the clubs may poke fun at their other rides, I've never heard of them withholding information or services due to brand disloyalty.
So, great analogy! Maybe you guys should think about being more inclusive, like the motorcycle clubs you mentioned? Or continue on while people like me think you're silly snobs I guess.