It means a group of people unlikely to be stopped and turned away at that gate. My assumption is white, middle class, dressed boring but clean, decent car without damage, with young kid(s), no/light tattoos, no motorcyckes in the back and no drug/booze/gun stickers or visible stuff. Basically someone the Karen's won't call to complain about.

Other people deserve access to public land too but might not pass the vibe check of the private guards, which is what op was lamenting as well.