Sorry for not being a nutritionist

Hello guys, I’m a stocker at Walmart and I’m 23 years old. There was this customer yesterday, an elderly man, who had been looking for a bar of chocolate for about 10 minutes. My helpful a^s couldn't resist, so I asked him if he needed help. He said he needed help because he couldn't find his favorite protein bar. I searched for it as well but couldn't find it either. As a result, he decided to purchase a different protein bar. He chose one and asked me to read the ingredients and explain them to him. I told him that I could read the ingredients but wasn't sure what he meant by "explaining" them. He said he just wanted to know what the protein bar would do to his body and needed a breakdown from me, a Walmart associate. I told him, "Sir, I can't explain that to you because I don't know either. I'm not a nutritionist after all." You guys should have seen the disappointment on his face 😂 it was hilarious. He looked like he had just lost hope for the future, for the youth. He left without saying a word, still wearing that disappointed look on his face.