Maybe you could stay in a position long enough to move up to manager - and that's when you can actually start using your safety and confrontation skills when it comes to other people. Because people generally don't like being told off by someone who isn't their boss. So unless its something life-and-death related when it comes to working on a vehicle I would just keep my head down if I were you. Just show up to work, do your best work, and leave when your shift ends. Don't partake in anything that could draw you into starting a confrontation, no matter what the other guys are doing.
I have a mechanic down the street who works on my car and he's at least 45 years old, he seems very mellow and seems like the type of person who wouldn't tolerate working with jerks or guys who don't take their job seriously, but he also owns the place.
You just gotta find a place where you're more compatible working at. Guys can't be that reckless in every shop. I'm sure your next job, you'll find good guys there. If not, just look for another shop. Find shops with guys who are a little bit older maybe.