The logic doesn't hold up here. 'I harshly judge people for not returning shopping carts where they belong, therefore I must secretly have a far worse problem returning shopping carts.'
You can apply to that anything and see that it's a bit ridiculous to make it a blanket statement; sometimes people judge each other because they honestly hold strong opinions and/or are just judgmental people.

Sounds like something a person addicted to hoarding shopping carts would say.