you know the thing is, even if your food taste is painfully white, even if you have absolutely no experience with other cuisines at all, even if you're really bad at trying new things
that's something that can be worked on. you don't have to self-flagellate over it, you can work on expanding your horizons in small steps.
i've got the autistic food sensitivities a lot of the time, especially with texture, and out of not wanting to risk something going badly i kind of fell into eating the same things over and over in a way that absolutely wasn't healthy
so a while back i started with the support of my friends to like... work on that. push on my painfully white spice tolerance to be able to eat any spice at all, try different things at the mall than Generic American Sub Restaurant, shit like that. it's still a process, and it's still something i have to work on, but i am working on it.
being culturally oblivious isn't a permanent stain on your character, it's something you can change if you put in the effort. and you won't like everything, you absolutely won't like everything, but if you take a moment to step outside of your very white comfort zone, you're almost certainly going to find at least something you like
YES THIS. I'm also autistic & painfully white, I also had ARFID extremely badly last year. After a year of working on it, I can eat noodles and onions and have started to develop more of a spice tolerance. I'm even starting to find the food I used to eat bland, and there's so so much good food out there that I'm excited to try.
You can do it in small steps, when you're comfortable, when you know you have a backup option so you know you won't go hungry if you don't like the food you're going to try. I've also found growing the food myself really made me more willing to try it, and now there's a species of mushroom I can eat!