Manchester United's players were still inside the bus while it was being attacked.
James McCarthy's foul will see the West Ham star sitting out the next few months for his club.
Mourinho's altercation with Jon Moss has landed him in hot water.
Mourinho is under pressure after another humiliating defeat.
After a fan revolt led to Barton not being signed by West Ham, the controversial midfielder issues a response.
The player has also been accused of threatening kill his ex and "blow up" her house.
Fans were not at all happy with the defender's performance.