Working at Whole foods as a cashier

I began talking to a customer on Sunday as I rang up his order. He looked to be about 36 years old, and seemed happy, though a little tense.He came around the side and started bagging for himself.
"I worked hard for a long time to be able to afford this for myself," he said to me.
The customers that come into my store are commonly upper class and primarily wealthy. I see a lot of young people that have obviously not had to worry about money in their lives so far.
"What do you do?" I asked him, expecting to hear that he was a lawyer or a financial adviser. I often hear people talking on their little ear phones to invisible partners about buying and selling homes and stock while I work. This has become quite standard to me, right along with the women with their Prada and Louis Vuitton and Chanel bags and wallets and belts and glasses.
"I'm a waiter, " he said to me.
I honestly thought he was joking.
I looked up at him, prepared to accept and join in on whatever humor he wanted to share with me.
He was serious.
It was close. I was one slight muscle movement away from joining in on his joke, and making an ass of myself. My robotic self was humbled.
I said nothing for a moment, but continued to ring his order as he bagged.
"Where do you work?" I asked.
He mentioned a restaurant that I've never noticed, but is on my way home in a very affluent stretch of restaurants and boutiques. I told him I probably knew of it, and we didn't say much else. He paid and left, and I continued to work.