re: Am I about to get fired from my 2nd job??

So what was the outcome with the underage co-workers and the police that you called?

Based on just what you have posted here it is likely that you will lose your job at some point. Not getting along with manager and co-workers will be the reason should that happen.

Your last statement is interesting though. You made a point to counsel us before answering, did you offer the same to the co-workers as reason for your strong position?