You may (you obviously do) disapprove of what is said. But what on earth does it have to do with being American? Or rather, why did you choose to point it up with a title that says you feel sorry to be an American?
Do you mean there's some kind of unwritten law that says Americans have to behave in a particular way to be worthy of the name? And that way includes fulsomely promising prayers for anyone in distress?
You know, you're an ace away from implying this commenter is guilty of un-American behaviour...
It feels very weird to a European.
National pride based on nothing but birth and a flag is something I don't much get.