can they truly play on any surface? Djokovic has harsh words after quarterfinal loss

If playing conditions are the same for both opponents, one would think that any surface is fair game.   It appears that these top players are a bit spoiled, perhaps a new surface might show who is a true champion against the odds...?   I don't know but its a bit much!  so stop already....get over it!
TENNIS.com - News Headlines - Djokovic has harsh words after quarterfinal loss