As it can be seen in a video taken by Cuatro, two fans hit Bale and Jesé's cars after these two players refused to stop and talk to them. Shortly after, Sergio Ramos appeared and asked the fans to explain their attitude, indicating that Real Madrid "left everything on the pitch."
These two fans certainly overreacted to the loss. For once, Real Madrid played with heart and probably deserved more than a loss at the Camp Nou. The security guard present in Valdebebas should also be mentioned, as he does nothing to stop these fans from confronting the players.
It's a spectacle that should not have happened and Real Madrid fans will surely be happy to see Sergio Ramos defending his teammates after such a difficult loss.