That's honestly the only real conclusion I can see from this type of thought process though,
That's because you have trouble with nuance.
Honestly I think the thing here is the fact that as I've stated before many times, I don't feel any type of cultural or ethnic connections. They are just far too weak in my case, and thus I can't see myself as anything other than my chosen constructed identity, and I suppose a Midwesterner. I thought this. Honestly I didn't even know of my ethnic background until some middle school assignment. I only thought of myself as "white" and nothing more.
I don't know much about the sociology surrounding subcultural groups that operate without reference to transgenerational cultural transmission or the family unit, so I can't really answer this question.
Was actually kind of telling, at least as to why you've expressed horror before at my views that one's constructed and chosen aspects of their identity matter far more than anything born into. But after all, these type of subcultural groups are pretty much all I have experience with. We basically have a complete inverse of familiarity.
But let me just say that
I honestly simply can not comprehend this type of thought. Chalk it up to my aforementioned very weak and diluted familial heritage in regards to anything perhaps, but as noted before, I am not exactly atypical in the US.