I know what you mean, but I had no choice but to learn English, the people where I was unfortunately born use it all the time 
America just sucks so hard. Really. I’m not joking.
Japan? Japan was by far the friendliest place I’ve ever been treated as a stranger- even before coherent polite distal Japanese keigo left my mouth. Once that happened, I was treated even better than I am occasionally by my own family, here in the US.
The Swiss, I’m told, are arrogant af towards foreigners trying to actually learn and work at watchmaking in Switzerland (I have experience in this field as well, though most Swiss I’ve met in that capacity have been kind). Even if that were true, there are things recorded in rare books in several of their dialects that don’t exist anywhere else. I need that information, so I will learn Swiss French, and Swiss German, where applicable.
Language is merely a tool for an end, no different than any other tool I use on a daily basis. And I use a lot of tools. If your argument against learning to communicate in a more varied way is completely based on how kind the people are that use it you have missed the point of it.
For the record, Japan does not treat immigrants universally poorly. It is a complex situation and depends on who the Immigrant is and what reason they are there for. As well as the socio-economic background of the person doing the treating.
Now the mental health system there is something you can assail all you want- its just abysmal.
