Yes, cruisers from those locations are fun to cruise with. But I have found wonderful cruisers on Royal from all over the world.
On our Allure cruise I met some fun loving, friendly people from Brazil.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Top-notch!