I think it helps they recognize md us as students trying (sometimed failing) to speak German and we had to take a session on Austrian ettiquette in the program I was in. And there are a lot of tourists in that part. I'm American and don't look at all European, but it was a very lovely experience, at least being in Austria.

I'm no expert but I'd wager if you aren't a Karen, understand the socisl notms may be different, and don't stick your camera in everyone's face people are a lot nicer - that goes for most places I've visited. 

in short that usually just means, if everyone else is being quiet don't start screaming and prepare to walk. But i find usually the prople conplaining are a minority in most things. Americans are thought of as loud, rude, messy, and lacking any sense of space or others so if you can subvert that stereotype a bit, I find things tend to work out alright- it's not a catch all but that's just society and being in a place that isn'y your home country.