I am a fan of Colbert and I am Asian. I'll speak to this issue in a more general sense and not specifically about Colbert. I am all for this type of humor as long as the person making the joke is perfectly comfortable and willing to make such a joke about any race and stereotype. There are certain comedians and entertainers that will stay away from specific groups because they are worried about backlash but will gladly joke about another group because they view them as less threatening or think that it's more socially accepted. Either everything is fair game or nothing is. Don't just joke on whites, asians...whatever, because you think those are the "safe" races or that you won't get beat up.