If you think America sucks so bad you should leave. Find that place you think is so wonderful. Have you seen how blacks are treated in Europe? Maybe you know of a place in Africa that has a better standard of living than what you now enjoy. Chinese and Japanese hate foreigners. Have you seen how aborigines are treated by many Australians?
You think you are making a political statement. The only statement you are making with your "America was never great" headwear is a statement of your ignorance.
While I'm up here on my soapbox, "eat shit and die" is not a death threat. It is rude, but no more. And don't act surprised your hat has generated hate mail and comments. That was the reaction you were looking for.