I’ve seen videos from a European’s PoV regarding the presence of either American expats or tourists speaking loud at venues (like indoor restaurants or hotels) where one is expected to use their inside voice rather than yelling from the top of their lungs.
Is it a cultural difference they are unaware of before they even stepped foot into a European country? To clarify: you’re just sitting on the table minding your own business but you can hear them talk across the venue using their outside voice whilst indoors.
Even though you may remain indifferent: rather it’s inconsiderate when it comes to common courtesy in public spaces. It’s the same in reverse like while a European speaks normally is responded by being yelled at from an American despite being next to each other.
I never met an american tourist, but I don’t think this question makes a lot of sense because both Europe and the EU have a lot of countries with different cultures. For example, here in Portugal we have the preconception that people in the north (germany, sweden, denmark, etc) are very quiet and mind their own business. So an american tourist would be loud compared to whose standards? Ours? The Germans? Etc
Now, what I heard a lot from many different people, both in real life and on the internet, is that american tourists tend to have a “self importance” air about them. A friend told me a story that an american tried to tip her dollars several times, even though they were told that she could only accept Euros.
Americans are loud even by southern European standards. And it’s not just about volume, but their ability to encroach on all spaces around them.
It’s not as bad if they come from a city like New York, where people are socialized to respect personal boundaries to a point, but even then it’s noticeable.
Though to be fair, forgetting that is very much in character for our American friends.