Why are american tourists sometimes referred to as “ ugly americans”?

Ugly American" is a pejorative term used to refer to perceptions of loud, arrogant, demeaning, thoughtless, ignorant, and ethnocentric behavior of American citizens mainly abroad, but also at home. Although the term is usually associated with or applied to travelers and tourists, it also applies to U.S. corporate businesses 

C) the defeat of spain at the battle of bloody marsh