Disclosure I am her boyfriend using her account

I am a 26 year old male who works as a gas staion clerk. I was working my normal closing shift at a truck stop when a customer went into the bathroom. And was in there for almost thirty minutes. Little side note to mention he was an older gentleman. I had gotten worried and knocked normally, had no response. I left, and 5 minutes later wiggle the door knob, and yet no response. About ten minutes goes by and i was seriously worried he had had a medical emergency and i pounded on the door. He immediately he went apeshit. Cussing me out from in the bathroom. I knew he was okay at that point so i just walked off, not willing to respond to someone who is being hostile. He later comes out and cusses me out, asking who'd knocked on the door. I answered honestly, and i told him how we've been having issues with said door knob and people over dosing. (Did not listen to my concern on if he was ok or not, and proceeded to berate me.) i then just stood there looking at him like the retard he was acting. Obviously getting pissed at him my face showed it, and he began to choose his words wisely. Obviously acting like he had an okay argument to sit there and berate an employee for a welfare check. He then left the store.

So reddit, am i the asshole?