Just had a text from a friend who is at the race and he said Lorenzo was booed and people left in droves immediately after the race, did not even wait for the celebration.
Quite a few were annoyed that they were denied a great battle at the front by having Rossi starting at the rear.
Lorenzo rode a good race, but was surprised Marquez did not pass him or was there a conspiracy to have a Spaniard win the title. Repsol have huge political clout in Spain and if they could not win the title then ensured a Spaniard won it.
I am only suggesting it as a possibility.