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The point is valid, but perhaps not relevant. Broadly, yes, Americans are easy to spot abroad. Attitude, behavior etc are all part of culture.
Yes, an American from NY and one from Alabama will have massive differences, but culture (anywhere) doesn't mean that people are all the same.
Deep down, if you substitute "culture" for "race" in most (not all) conversations you get a much closer understanding of the real problem. For example the first lady is an immigrant, but clearly the right kind.
Comments should get more thoughtful and substantive, not less, as a topic gets more divisive.
When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."
Please don't fulminate. Please don't sneer, including at the rest of the community.
Eschew flamebait. Avoid generic tangents. Omit internet tropes.
Please don't use Hacker News for political or ideological battle. It tramples curiosity.