I'd have just mentioned it to the neighbor (as long as they weren't buttheads) except for the throwing butts in my yard. For me, that puts it straight up to telling him directly to cut it out. Sort of like some people think it's OK to let their dogs crap in your yard. I don't let my dogs crap in other people's yards, and I expect the same courtesy from them.

I have issues with people who seem to think that since my property borders the river, they can cross my fences and go walking around on my property wherever they damn well feel like. Had one recently that the wife found walking along the parallel to our house along the treeline, right in the middle of our property. After she told him it was private property and he needed to leave, he proceeded to keep right on going until she made it clear that he needed to get the hell off or she'd call the sheriff, and the dogs were there to make sure he went the right way. The signs and barb wire fence must not be clear enough.

Both of them are just manifestations of utter inconsideration.