You are sooooooooooo correct!!! I moved back from living in Sweden for four years, and they were almost universally unfriendly and often downright rude. The food and weather were rotten, and everything was expensive as heck. I was climbing the walls to leave, and finally did so a few months ago.
I think this poll must have been taken by Swedes who never travel. Puh-leeze!
There were only several other countries to choose from. I have been to Russia, Turkey and China -- which were also choices. I can tell you the Russian people are humble (Swedes are not, just self-depreciating which is not humility) and Russians are very friendly and open. Chinese are fun (Swedes are not -- they won't even look at you rudely if you say hi to them walking by them on an open road -- they just stare ahead like "Borg". Turks? They like to talk and are open as well, although you always know you are an outsider as you aren't a Muslim.
The USA has the best of all worlds if you don't count the rude and materialistic people in Boston and New York.