<human>: Provide a brief overview of the text.

This happened a few days back.
I´m a 20-year-old Student and I own a pair of over-ear headphones. On a wednesday morning at 10:00 a.m. I didn´t have any classes, so I tried to get some groceries. I just needed some water and meat, so I went to the cheapest supermarket and gathered my stuff. Even after getting into the checkout line, I still listened to my headphones, so I wasn´t really aware of my surroundings, shortly before me some 40-something bought a bottle of wine and a bottle of Ballantines. 
After that, it was my turn so I removed my headphones and suddenly the security gates begin beeping.
The man panicks, blushes and eventually comes back to the cashier. Turns out she didn´t check one of the bottles out. As he took them once again from the counter, he looks me dead in the eye and says:
"I don´t steal, I am a christian."
So my head just made me throw out the first thought that came to my mind: 
"Hey, I´m not the one buying two bottles of booze at ten in the morning."
Everyone just looked at me, until I realised, what I just said. The man was shortly baffled,after that he immediatly started a rant about the youth these days and no respect for elders in our society for about ten minutes. Everybody else was just dead silent. Eventually I just took my stuff and tried to run for it, but this man just followed me for a few metres and ranted even louder. Atleast twenty people must have seen me running from a screaming adult with a water container in my hands.
<bot>: Accused someone indirectly of being an alcoholic and had to get a full speech about moral virtues and the decline of which in our society.