I've been stopped by the same woman twice now kind of badgering me about the way I grocery shop.

My lo goes to work with me, by the end of the day she is falls asleep as soon as I start the car, so when I go into the grocery store I keep her in her seat and put her in the stroller. Yes, she's a little old for that, but she's still well within the weight and height limits.
This lady says I'm weird for pushing my stroller through the store, but I think it's convenient, all my groceries fit underneath and I don't have to push a nasty cart. I get so grossed out watching people pour their super gross cans and bottles straight into the carts, then they put them back in with the other carts afterwards *shudder*.