Based on my time on the internet, the region with the most annoying political users is Europe. They almost always fall under one of these four categories:

Western Europeans with a superiority complex with the US
Western Europeans with an inferiority complex with the US
Eastern Europeans who want to ethnically cleanse each other (Serbia and Albania, Greece and Turkey, Armenia and Azerbaijan, Armenia and Turkey, Bosnia and Serbia, Poland and Belarus, Poland and Russia, Russia and Ukraine, Ukraine and Hungary, and the list goes on and on).
Ultra racist tankies, islamists, or neo nazis who want to see the collapse of the EU, the eradication of immigrants, and "independence from US occupation"

Per capita, they're second to none in ignorance, arrogance, and sheer whininess. However, they tend to get drowned out by the sheer amount American users on any given platform.