As with anything there are bad sportsmen out there. You can either let it ruin your trip (weekend, or whatever) or just let it go. Personally I havent had anyone try throwing their lines over mine but I have had a few boats move in pretty dang close at times. I always drop my tops at night but there are still a few boats around and they'll see me in a cove or somewhere. Maybe there's a time I'll head into a particular cove and already see a boat in there. It's OK, there's more tops out they dont know about. Fishing is supposed to be fun and relaxing, or as hard as you want to work at it. But it is still supposed to be fun. I think that's the thing we, as sportsmen, should remember.
Health nuts are going to feel stupid someday, lying in hospitals dying of nothing.