Then it is irrelevant. Showing that humour X can be as crude and vulgar as American humour doesn't disprove that American humour is crude and vulgar. In fact, it says "yeah, it is crude and vulgar, but check out this example of crudeness and vulgarity in humour X!"
Agreed, Showing that one example is crude means nothing. My point is that America can't laugh at any good joke. The one shining light, I think, In all of this crude and violent humor is Zach Galifianakis, He is hilarious and rarely is he dirty or crude.