Not stereotyping here, I have some friends, including a few on here, who love to try new things and appreciate even wholly western cuisine. But I've known a lot of Vietnamese who won't even try Chinese food that isn't already part of Vietnamese cuisine, and Korean, Japanese, they won't touch.
We took two kids out for pizza, thought it would be a real treat for them .. when they saw it wasn't rice or noodles they got wide-eyed, and we ended sending them upstairs with a chaperone to have beef noodle. It was still a treat for them. OTOH I've seen other kids the same age, talked into trying it, absolutely loving it.
Kids not liking 'za .. it jus' don' seem RAT.
When our housekeeper ordered a Korean hotpot at Longmonaco, I was stunned. It didn't taste Vietnamese at all. But she complained about spending that much to eat.