u/SuperFlyN

Context: I'm at the grocery store and a lady is blocking one half of the aisle, while her shopping cart is blocking the other half. The aisles are narrow, so I can't get through, and I wait until she or her cart moves. She moves her cart and I pass through, but instead of apologizing for blocking the entire aisle, she says "you're welcome" in a sarcastic manner. Was I supposed to thank her for not blocking the aisle anymore? Her lack of awareness didn't justify a confrontation, so I ignored her and walked away.