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Had a similar experience the other day, a couple of guys show up and are swearing loudly. Just happened to be the only trip this year that I didn't have a bunch of kids with me, otherwise I would have been compelled to say something, still didn't want to listen to a couple drunks bicker loudly. As far as the trash, seems I always come back with a lot more than I make. A lot of ignorant slobs out there. Not sure what we can do, other than pick up the trash we come across. If they don't know their behavior is wrong, there's no way you can tell them that would make a difference. Just be a fist fight. I guess if the behavior is bad enough get the authorities involved.
There will always be the slobs that leave trash around & use profanity regardless of who's in hearing range. If you're young enough & tough enough, confront them. Most would say don't have a confrontation, that's an individual decision, right or wrong.As for the "No Trespassing Signs", personally I exercise my rights under the "Great Ponds Act", only if it's "unimproved land" and I feel I'm not violating someone's privacy.http://www.mainelegislature.org/legis/statutes/17/title17sec3860.html
What is considered "Unimproved land"?
$500 fine for littering if you can get a warden on them.