Man I feel your pain. All you can do is try elsewhere.
If your stand was already in place I would definately say
something. (and then remove my stand as noisily as possible.)
Hunting public land is a pain at times but after you pattern the other
hunters you can usually find good spots away from the crowds. Most hunters dont want to walk very far so most of my spots are over a half mile from the nearest road or across a creek. I used to put ribbons up to mark my spots but it ended up attracting the out of town
hunters that didnt know the area. I did get a couple of deer
during the bowseason but the other hunters aggravated me
so much this year that Ive quit hunting this season. Even though
the season doesnt end until february.