We may not discriminate per se, it seems to be more of a question of what other societal barriers might be there that put certain minorities off. I think it has been established that income is one, and to my mind one way to tackle that is to discourage the idea that you have to have gucci kit. Also the notion that wilderness is necessary to practice. We used to have a mental health group renting a few contigous plots from our allotment association where amongst other things they did a little urban "bushcraft" That group ended because they ran out of funding, however the scouts rent those plots now.
It’s hard for me to write the right stuff but my understanding from various sources is that it’s this sort of challenge across lots of different groups and activities. Most of those would also not actively discriminate but it’s not as simple as that. There are some good podcasts out there they discuss it without being heavy handed about it.