Why are American tourists sometimes referred to as "Ugly Americans"?

Responses

American tourists often spend exorbitant amounts of money.
American tourists often spend exorbitant amounts of money.

American tourists behave in a way that is unintentionally disrespectful to different cultures due to their lack of cultural awareness.
American tourists behave in a way that is unintentionally disrespectful to different cultures due to their lack of cultural awareness.

American tourists are well known for having the least attractive visitors—most of whom are overweight.
American tourists are well known for having the least attractive visitors—most of whom are overweight.

none of the above

It is mostly due to the stereotype that American tourists are loud, rude, and entitled while traveling abroad. This behavior can sometimes come across as arrogant or disrespectful to locals in other countries.