Like i said, clearly he was resting his players.
Plus, even if we suppose that he didn't rest half of his players, and that he was actually taking this game seriously, this is the first time he loses a Classico in 90 minutes, the fact that all hell breaks loose when he loses his first classico, while few people make such a fuss when Mourinho always loses, shows you that even those who explicitly deny Pep's superiority, at the same time they implicitly admit his superiority.
The Chelsea game will show if Guardiola was right to play his second tier team against Real.
Because i doubt the refs will show blatant favoritism to Chelsea like they did with Madrid.