Sorry Irishevox....
Yeah man it sucks.
But, as an ethical hunter yourself, you have to know this crap happens.
It get's better.
But, for the most part, you'll be dealing with idiots in the field the rest of your life.
The best thing to do is just get accustomed to it.
If we get guys trying to set up on us, the only really good thing you can do, is run over to them BEFORE they set up, and just ask super politely if they move a ways away.
The worst is trying to ask some yahoos to move... AFTER they've already set up. You always get the lazy response of , "Oh well, we already set up, we wont be a problem" but they always are a problem.
Another good trick is to take youth hunters with you. Idiot hunters are usually a lot cooler if you say something like, "Hey I've got a 12 year old with me, could you please relocate further away. I don't my son/brother/nephew to get shot accidently by you."
That works great.
lol
But yeah, other than that, the best thing to do, is treat everybody how you'd want to be treated.
As in, be nice to them, ask if they want to hunt with you, not against you.
Last, and worst case, is simply pick up and move yourself.
I know.... it sucks.
But really?? it's best for you.
You have a better chance at bagging birds if you move away from the yahoo that wont stop skybusting.

or... it may help to be 6' 10" and 320 lbs. (like me) and come walking up on guys in the dark and being all like, "Hey, I'm already set up 25 yards away. Please move." lol