Is there some way to make the Friends List update? It's stuck

Basically some time ago I ‘followed’ some of the Turn 10 staff so that I could race their ghosts in FM7 Bounty Hunter events. I found this also means I see them on all my ‘friends’ leaderboards in FH4 and see their ‘drivatars’ when I use offline mode as well. I deleted them from my friends list entirely, but they still appear in FH4. Is there some way to make them go away or am I stuck with them forever?

“Welcome to the Hotel California
You can check out any time you like but you can never leave…”

But seriously, I have no idea what the real answer to your question is.