Why should Usain Bolt celebrate?

Now what I cannot comprehend, is why the International Community criticizing on Usain Bolt for his manner of celebration after he broke the world record in the men's 100 and 200 meter ? I read that even the President of the International Olympic Committee (IOC) Jacques Rogge stated that "He should shake hands with his competitors and not ignore them" and "He'll learn that sooner or later. But (he's) a great athlete, of course". I have seen Bolt acknowledge and even childishly play around with his competitors. Many American athletes have celebrated their win in a similar manner and I am yet to see anyone hurl criticism at them. Usain is indeed very childish and his antics may just reflect his true age, lol but I think the criticism is undue and unprovoked. All athletes have that air about them, that comes with the territory even the most humble of competitors have an egotistical and bigheaded attitude while competing. I hope his ass keeps on breaking records left right and center and let those crazy Americans send their scientists to test the yams and the diet he grew up on in Jamaica. Those Americans always amaze me, just can't accept that they lost fair and square. Americans always finding fault in everything, it looks childish and it is simply annoying, and that is the character of a sore loser and unsportsmanlike behavior at its finest. Booo Hoo