Yeah, please do be polite.
Those jerky Board Members might not have been, but it looks like that non-for-profit shooting club is doing a lot of good work for the shooters in their community. Being a Board Member of a non-for-profit shooting club is often a thankless task. No pay. Have to interact tactfully with your membership, some of whom are jerks themselves.
And in this current climate, people come out of the woodwork to join the local clubs. Some people have never owned a gun before, just bought one 6 months ago, and want some place to go shoot. They have questionable safety and gun handling skills. My own club instituted an orientation and safety brief this winter as a result of the "banic". We've never done that in the club's 70 year history.
Anyway. A whole lot of non-for-profit clubs are overwhelmed with applications for membership. We've seen record numbers of applications at mine. Record. Many of them don't employ Range/Safety officers at the property. Never had a need to. So while it may appear you're being discriminated against, don't mistake it for your disability. We're discriminating against people who we can't trust not to be a safety risk to our other members on an unsupervised range at mine. I suspect that might be what you're experiencing.
We've seen a whole lot of people join our club since the gun control efforts that never cared to join before. We're happy to have them become a part of our community now, but in the back of our minds we do wonder why they've been a part of our membership area and only now want to join a club.
I'll make a call to the club, colleague to colleague as it were, and see what's going on if you're serious about joining the place.
By the way, there are many clubs who put conditions on membership like volunteer work parties or involvement at club matches. That's often written right into the club's By-laws. I belong to many clubs besides the one I'm a Board Member on. Some are too far away for me to come out for a weekend work party. Those who have such By-laws have always been accepting of my reasons for not attending those required work parties - "I have my own club to run, meetings to attend, and club business to conduct. And yours is over an hour away from me. I shoot matches there, and joined just to support your club. Would you take a donation in lieu of . . . . ?"
The answer has always been, "Yes, of course.'