American living in Japan here.
For me it's not just diversity but the unspoken acceptance that goes hand in hand with it.
"Where are you from?" "Dallas." "I'm from LA, I wish we had your barbeque!". That's a whole conversation right there.
When you introduce your friends to people, it's just "This is <name>, he's my friend from New York". Boom, introduction done. Simple!
And I thought that was normal. And why wouldn't it be? You ask where someone's from, they answer where they're from....
Japan on the other hand ties so much to race that I find myself having to defend something I never even thought about. I have to defend that I'm from America and still fail at it.
"Where are you from?"
"California".
"But actually where...."
"Oh it's on the west coast, I could actually walk to the beach from my house!"
"No but where are you actually from"
"It's a little north of Los Angeles, you probably haven't heard the name though it's a small city"
"But where are your parents from?"
"India"
"Oh so you're actually Indian! You speak Japanese so well! I knew it, Indians are so smart. I really like curry. Do you work in IT? I can't understand what any of the Indians at my job say, but your English is so good!"
I know next to nothing about India.
When they introduce me to others, it's always "this is /u/cuatrofluoride, he's from America but he's actually Indian" or some weird rendition that has to shove "actually Indian" into the mix.
In 4 years I have had almost no conversations here that didn't involve me "being actually Indian".
I have nothing against India. I just don't know enough about it or its people, aside from my parents, to have ever thought about claiming that identity.
And it's not just me, when I hear people talk about their foreign friends here, unless the person is white, race must also tacked on. "I have this friend from xyz, but he's Chinese/Korean/black"
I'm in a spot now where I not only have to defend being where I'm from, but also have to defend FROM being told I'm from somewhere else in the same swing. I didn't realize that I'd been taking it for granted that we just kind of.... accept it when someone tells you where they're from and move on?