Yes. You did three things wrong, two of which you mention and the other
is implied.
You mention you had a wonderful time 'as an American'. Would it have
been less good if you had visited as something else?
Meanwhile, there is no 'counter' in a bar. It is a bar, which is why
it's called a bar. Additionally, there is no bar keep (or bar tender),
there is a bar man or a bar maid (or in general, bar staff). I doubt the
bar person was pissed as that means they were inebriated. Perhaps you
meant annoyed rather than drunk.
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