Fat. So?

Ronaldo has achieved what no other footballer in history has managed. He's scored more goals than any other player in the finals of the World Cup, breaking Gerd Muller's record during the 3-0 win over Ghana.
But he still suffers from jibes about his weight. Even his own President had a pop at him before the tournament started.
And the issue is a talking point in the U.S too...see this article from USA TODAY talking about fat people's portrayal in films like "Shallow Hal" and "The Nutty Professor" .
So is it ok to make jokes about fat people? is it considered acceptable in a way that making jokes about someone's sexuality or skin colour isn't?
Let us know...