Apparently it wasn't just the bomb joke that cause a problem.
He apparently refused to take off his shoes and then tried to walk around the metal detector. When he was stopped from doing that then he made the bomb joke.
I do agree with the comments about TSA staff though, but the bigger problem is the idiots at higher levels(GW Bush and John Ashcroft to name but two). They are just trying to cover their rear ends with the public after 9/11 and they are the ones who hand the orders down.
Unfortunately, it's like a game of Chinese whispers and the translation from English to Spanish doesn't help matters.