I agree that whiteness is the default.
In schools where there is little importance given to non-white history this sends the message that someone is more important than the other.
Furthermore, the content on mainstream media mostly has white leads. As a non-white person consuming content there is an automatically created bias that a white person is desirable and has all the characteristics of a hero. It clearly sets up a precedent that whiteness is superior. A bias also exists where a non-white person treats a white person superior because of this media portrait of whiteness .
The question that can be asked is "How does a white person feel after seeing a positive portrayal of someone who looks like them, does it increase their confidence and self-worth or entitlement?"
The question I need to ask myself is "If more mainstream content existed that showed non-white people equally being heroic with desirable traits would that make me feel better about myself?"