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Americans don't learn other languages because they don't need to as English is considered the lingua franca.
But if an English speaker wants to live abroad, he or she must learn the local language of that country.
As an American who is only fluent in one language, I don't blame people for not being multilingual. But I do blame people who get weirdly mad about other languages existing. >

My wife had a coworker who would get mad if people near her weren't speaking English. And this was at a business that had more native Korean speakers than native English speakers >

In the middle of Hungary people get upset if someone don't speak hungarian. And complain barely audible that everyone should speak hungarian who dare to come to this country. lol >

Imagine if Colorado spoke one language, Arizona spoke another, Texas spoke their own, Florida had their own, etc. If America was like that, I guarantee the average American would know at least 2 languages. 
This is basically how Europe is. >

Ist's even worse. Almost every region in Europe has some special accents and dialects. 
There's at least 10 different germans. (29 different in total with Switzerland and Austria according to Wikipedia)
France and England are also really bad. >

I believe that is similar to how the English language/accents change if you move across the US. >

I never understood the hate for not Learning other languages. In Europe, you can have multiple countries within a few hours that all have different languages. You drive for 2+ days in the states and you are still in the states. The only language that might even come close to having some utility is Spanish and that is only useful if you live in the few the few states that boarder Mexico. I see almost no point in dedicating time to learning a language if you will never have anyone to talk to. 
Sure I could spend my time learning the German language to prove I am smart but if I have zero Germans around me then what the point? >

Agreed. Like it or not, English is the most international language so, yeah, you’d be dumb to not try and learn it - if you get the choice. 
I was born in Sweden so English is my 2nd language, but by age 15 pretty much everyone speaks English more or less fluently. Mostly thanks to that we don’t dub English movies or tv shows, so you get a “free” English lesson every time you turn the tv on. 
But I don’t go around being all pompous about my bilingualism. It is like OP said, it is a necessity. If Swedish was the “world language” I’d probably not speak English.
As comparison, I tried taking both German and French in school and failed miserably lol >

I don't think the issue is Americans being close minded, it's just that the vast majority of us don't have much of an incentive to learn another language. It's kind of a shitty excuse, but it is the truth. I'm bilingual because I grew up with a second language spoken in the house, but that's not the case for the majority of the country. 
So it's not like Americans don't want to, it's just that for the average citizen, there's not really a reason to. >

Where would you even encounter it is another issue. If your family speaks English, and your school speaks English, and your stores speak English, and your media is all in English, and the internet is majority English, then where exactly are you encountering anything else to practice? My district didn't even offer intro foreign language courses until high School. sure duolingo is a thing but without practice it's more difficult to stick >

I’m English and living in France and try very hard to speak and learn French, however 9 times out of 10 the person will just reply in English (even if I keep trying French) or they’ll refuse to speak slower and get shitty that I can’t understand and then angrily say it in English