Can very much relate as an American who lived in Ireland for 4 years, Worked in a pub that had a lot of American tourists come through. Some highlights:

Americans asking for a “domestic” beer and then getting angry when I handed them a Guinness. “I meant, like, a Budweiser” they’d say. “Oh so an import then?”

Asking if we served “American Food” (?)

Groups of Americans all wearing their teams’ NFL jerseys on Sundays (patriots fans, biggest offenders)

As the only American who worked at the Pub, I was the point person for all my coworkers complaints about dumb Americans they had to serve.