Actually, on the 36 ball inning, Gavaskar himself admitted that he took a nick on the 2nd ball of the innings which went un-noticed by England. He did not accept the truth and leave the crease.
And his innings was widely regarded as his expression of contempt towards the then captain.
Also, as Ricky ponting pointed out, he is a selfish guy who came out of the ground with his team because umpire gave him as out.. (now go read the first para again)
