He deserved to be bad mouthed. You don't retire from a tennis match because you are a little tired. You retire because you twisted your ankle or strained a muscle or injured your wrist. You don't WD from a match because you are tired. Where is the honor in that?
Novak tried to say he was cramping. Not once did he show signs of cramping. Dude is a liar. Go Fed!
It´s all psychological from Federer. He knows Djokovic will be a close rival for him for years to come, and Fed knows how to play the mental game. It´s not like he had to say those things, just wanted to give a little verbal snap.