America and loud obnoxiousness are synonyms in lots of the world. People laugh at loud people and say oh they're probably american.
When I was in Holland this is exactly what my dutch friends said everytime they saw loud people. In Mexico there are lots of resorts where people literally try to get away from Americans. There are places where Canadians are welcome and everyone there tries to shield out Americans from buying property.
It's 100% true. I totally understand why us Americans would have our blinders on about this however.