You can remove a friend from your friends list at any time.
Here are some steps to remove a friend:
1. Click on Hard Rock World Tour in the upper left corner of the screen (if you are currently in a game).
2. Click on your avatar's picture in the upper right corner of the screen, then click on Profile.
3. Click on Friends at the top of the screen.
4. Locate the friend you would like to remove, and click on them.
5. Click on the More option just above their avatar.
6. Click Remove Friend.
Once clicked, you and this player will no longer appear on each other's friends lists.