Its hard to offend whats possibly one of the most diverse countries in the world. It was silent because it wasn't all that funny. Its something you say with friends because you know it makes you sound like an idiot. Aside from that, its a term we use to make fun of people with extreme ethnocentrism in America. A good majority of this country is made up of Pessimists who dislike living here by my observation. So, no its not offensive, it just makes you look like a foreign asshole if you're the only one laughing.