Ireland is probably the friendliest I’ve been too. The Irish are great people.

Rome (I know, not a country, but I can’t comment on the rest of Italy) is probably the least friendly place I’ve been to. Romans are assholes. It’s a very cool city, but the people, especially outside of tourist traps suck.

The Japanese are very polite, respectful, and helpful (almost to a fault) but I’m not sure if I’d generally describe them as friendly.

Really depends on the skin color of the person visiting and where they are visiting in that country. A non-white visiting most West-European cities will be mostly fine, but if they go out to the country-side, things can be very different.

I watched a documentary of an Indian boy adopted to a Swiss family who then went back to India to visit. He had a terrible time in Switzerland due to racism and nearly as an awful time in India, because he couldn’t speak the language and people thus assumed he was a Pakistani spy.