What is some examples of ethnocentrism in America?

In nursing we are taught that ethnocentrism is basically believing that your culture is superior to any other culture and when you are ethnocentric you tend to care for patients from your cultural beliefs instead of others.

An example could be (not necessarily in nursing) that when a Muslim person is buried they are buried in a coffin with no regard to where Mecca is located. This would be ethnocentric because first off I don't believe they like to be buried in coffins but rather wrapped in a white sheet and secondly they are supposed to be buried facing Mecca.

Another example would be that you feed a Jewish person something containing pig without telling them that it is an ingredient in their food. Or rather they need a heart valve transplant and you give them a pig valve. These would be disregarding their culture because you believe that what you are doing is better for them with no regard for what they believe.