If an hispanic/latino is fully westernized (didn't retain any of their roots), are the parents at fault?

I'm Mexican-American (non-white) that can't even make a single soup, nor beans nor anything from Mexico. I can't even speak Spanish correctly without an accent.
My parents were already on their 5th year of speaking English by the time they had me. They didn't focus too much on teaching me their culture nor native language. They took too long in teaching me Spanish; I was already 13 years old by then.

A couple relatives in the family were disappointed and someone once referred me as a coconut; told me I had no hispanic heritage within me, none.
If an hispanic/latino is fully westernized (didn't retain any of their roots), are the parents at fault?
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