I think you missed an opportunity. Waffling myself against a shelf is one of my favorite ways to fat shame. Whenever I encounter a lard barge in an aisle, I make a production out of making enough space for it get by me. It’s both polite and shaming at the same time. It embarrasses them yet there’s nothing they can say. It’s particularly effective for me because I usually shop on the way home from the gym when I’m all pumped up in minimal clothing.