Bagboy: Do you need help out today?
Me: No, I'm fine, thank you.
Bagboy: Because I can get these for you.
Me: No, seriously, I've got this.
Bagboy: Are you sure?
Me: Yes, thank you.
Bagboy: Ma'am, are you sure?
Me: I'm positive.
My sister suggested he didn't want to help the person behind me, but I had a lot more stuff than she did, and the weather here was dismal so he wasn't angling to get outside.