Sara Falcon is what you call a European who makes baseless and uneducated claims about the US. Often these claims have the effect of erasing the varied and diverse cultures that exist there. It is in the same spirit as the more well-known term Karen. When called out they will often resort to racism and xenophobia. In the most severe cases, they will be too arrogant to admit their mistake and will claim that everything they said is a "social experiment" that results in the most embarrassing ratio in the history of social media.
Ex. European: Americans have no culture and only speak English. American: ¿Por qué no te callas, Sara Falcon?