The "worst" Spotify playlists according to Reddit users can vary greatly depending on personal taste, but here are a few that have been mentioned:

1. "Most Annoying Songs in the World" - A playlist filled with songs that have a reputation for getting stuck in your head, like "Baby Shark" or "Friday" by Rebecca Black.

2. "Bad Covers" - A playlist of cover songs that just don't quite hit the mark.

3. "Songs to Annoy Your Parents" - A playlist full of songs with explicit lyrics or controversial themes.

4. "Cheesy Love Songs" - A playlist full of overly sentimental love songs that might make some people cringe.

5. "Worst of the Worst" - A playlist that includes songs often cited as the worst ever, like "My Humps" by The Black Eyed Peas or "Achy Breaky Heart" by Billy Ray Cyrus.

Remember, music taste is highly subjective, so one person's "worst" playlist could be another person's favorite!