Why are some customers so difficult?

I was bagging for this lady last night and there were these 2 cups of soup and a couple pop tart boxes that I put in the bottom of the sack, and I stacked these two light bags of apples on top and she yells at me that I’m going to crush everything, so I took them out and put them in a separate bag. I looked in the... show more I was bagging for this lady last night and there were these 2 cups of soup and a couple pop tart boxes that I put in the bottom of the sack, and I stacked these two light bags of apples on top and she yells at me that I’m going to crush everything, so I took them out and put them in a separate bag. I looked in the first bag and literally nothing was crushed. When she walked away I was talking to the cashier and even she agreed with me that I didn’t do anything wrong. The lady heard because when I turned she was looking at me and then she turned around and walked out of the store, so now she’s going to go complain to my boss. Did I do a bad job or are some customers just difficult like that?
Update: The apples weren't the full size ones, they were the mini ones. I apologize for not adding that in to begin with. They weren't heavy at all. You weren't there so you can't tell me that they were.
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