[Fred Meyers] Offer curbside pickup for Goodnites

My son 9m is upset with me right now for an incident that happened yesterday at the store. Yesterday we were at the store to stock up on groceries, it was me 37f, my son 9m and daughter 7f. My son still wets the bed and wears Goodnites ( big kid pull ups for bedwetting) for it and we went and got those first like we always do so we can hide them underneath other stuff. It went pretty good for most of the trip but there was an issue when we got to checkout. I was unloading the last of the groceries when I heard him say in a kinda worried voice " no mom please stop ", but i had already put his Goodnites on the belt. I asked him what was wrong, he pointed out that his friend was at the store with her parents and might see us and he didn't want her to see his Goodnites. I said it would be okay and put the last of the other groceries around his Goodnites so nobody would see them. We got our stuff rang up and left with no problems, but my son didn't say a word to me on the car ride home. Later I asked him what was making him so upset, he said he didn't want his friend to see his Goodnites and that's why he wanted me to stop unloading the groceries and said I was being a jerk for not stopping and his friend almost seeing them. I explained to him that I never meant to make him feel bad I just needed to get the groceries unloaded so they could be rung up. But this didn't help and he said I was being a jerk and didn't talk to me much for the rest of the evening and was very quiet at Breakfast today. I asked him if he was still upset and he said yes he was cuz I was a jerk. Update : I just talked to my son and apologized to him for making him feel like I didn't care about his feelings and being a jerk at the store, I told him I never meant to make him feel bad and I was sorry I did. I promised him we will be buying his Goodnites using curbside pickup from now on ( we do most of our shopping at Fred Meyers and they offer free delivery for orders 35$ and up so making his Goodnites part of a bigger delivery will work fine for us and not hurt our Budget ), he was quite glad to hear this which makes me wish I had done it sooner. He accepted my apology and we cuddled for a few minutes and now we're about to cuddle up on the couch and watch a movie that he picks out. Thanks everyone for your help!