I know exactly how you feel, and been in those same type situations before. I can't stand other so-called turkey hunters that try to sneak on anothers bird. I guess sometimes a hunter may not realize someone is actually hunting that tom, or if its a hen. I've heard some darn good callers in the woods you'd swear was a hen, and some hens actually talking you'd swear were hunters. But if I hear hen calls I'll throw a crow call at them, and see if i get a response from another possible hunter. If so I move on. I also wish hunters would move to other woods if see someone alreadly parked there or know of another hunter in the area. Least thats what I do, unless I know the hunter in the area, and pretalk with them on who'll hit what sections for toms.
I was once working a bird about 95yds in from a small road. Its a old family farm. The tom was gobbling, and coming in. I could see his red head coming through the trees. I hear a vehicle stop out on the road, and suddenly yelp, yelp coming from the vehicle. Needless to say the tom gobbled back, so they called more. The tom turned, and headed towards the road, down a embankment so I wasn't going to get the shot I'd hoped for. I had a slight chance at his head through a tiny opening. I took it, and never touched him. He flew off, and I heard the vehicle take off as well. I was so friggen angry I wanted to find those idiots. But I knew that'd only end up in trouble, becasue I was so mad.
Had another time went to a spot I'd prescouted a nice bird on public land. Noone was there, so in I go. Well about 8:30am I find him, and working him slowly in. Again I spot his red head about 60yds out. He's slow moving, but coming. Suddenly I hear yelps on the other side of him, from way I originally walked in. First I think hen, then tell its not such good calling. I see the tom turn away. I crow called. But the idiot keeps calling. The tom shutup, and left the area. Niether got the shot. I was really heated. I looked around, and didn't find nobody. So I started to think again it was a hen. Until I get down to my truck, and there's another truck parked right next to me. I left a thank you note on his vehicle, telling him I hope I could return the favor someday for ruining my hunt, and spooking the tom. Dam some people are ignorant!!! [:'(]