One of the big rules about being a DJ in commercial radio is that you don't comment negatively about a song or artist on the air. I was surprised, then, in the early '90s when a national countdown show finished playing the biggest hits of the year. After the show ended, the station's DJ took a call from a listener, who said, "Can you believe what was number one this year? Blech!" The DJ admitted, "I know; I don't get that either."
Although I didn't care for the song in question, I was surprised to hear a DJ slam a song that his station had played frequently.
