That's too bad, but am afraid that trend is spreading.
I just knock on the door or catch them in the field. Always be extra polite, offer some of your take, and promise to clean up after yourself. Slob hunters have ruined many a good spot for the rest of us. I also don't show up wearing camo, I think it just makes you look too eager or greedy.
If he says no, you can look elsewhere or politely ask why. I got into a few after a no by promising not to hunt until after deer season.
Crow's Fork Game Calls Pro Staff