Fuck 'em if it happens again or somthing worry about it, key his car, fuck his shit up somehow. Take this one laying down it's just easier.
People will always fuck with you. I got a new job at a resteraunt, you should hear how the head chef/owner treats people. it's fabulous, you learn to tune his ass out so quick
I bet he was you 29 years ago and is just pissed he is still working there and throwing away other people's garbage. I agree he is upset at life and took it out on you. A douchbag move. Tell him if he wants to be a douchbag then to not do you any favors and leave you trash. Haveanicedaythankyouverymuch!
or piss on his pillow... then let it dry just enough not to soak through the pillowcase until he puts his head on it. Seriously, just let the shit go. Unfortunately there are people walk around with chips on their shoulders and who assume younger folks are lazy. Asshats like the aforementioned bitter 45 year old haven't learned that the negativity they project at work comes back to roost; it makes the job really suck. I suppose if he was wise enough to get that he wouldn't be working part time produce at 45.