I was called out, berated, and forced into an apology at the supermarket...

At the supermarket, I placed my items on the counter, and they were all organized by category and type. The super-talkative cashier called me out for arranging all the items and said she had never seen such organization. I literally didn't know what to say and couldn't tell if she was making fun of me or trying to force me into an apology. She ended up telling the person who was helping her as she continued to ring up items.

I did say, "sorry," and they both laughed. So, I still don't know what to make of this situation. This has never happened before, and I always arrange the items the same way.