"Dont talk bad about us or we'll penalize you!" seems quite defensive.
Seems to me that a far more effective strategy would be to discuss this with the drivers and then, if there is negativity on social media, address it in a constructive, straight up way; as in "We understand that you disagree with the track's decision regarding X, here is our perspective..." People can flame if they want, but if you deal with the flames in a professional manner, and if drivers and crew and fans understand that if there was a mistake that you will take measures to prevent the same issue from recurring, it will go a long way towards building respect for Hillside.