My most hated was macaroni salad. Bowtie noodles with Miracle Whip, peas, shredded carrot, dill, and salt. Occasionally other items would make an appearance, but the main recipe was the most common.
It was so bland and mushy, and it wasn’t helped by the fact that it was made every few weeks during the summer, and in a quantity that meant I was eating it for lunch and dinner for almost a whole week every time it was made.