defaultism

An approach or situation in which something occurs by default, without being explicitly introduced.

US defaultism

But, in being an African-American politician, [Obama] […] introduces race by default. This racial defaultism is what must be considered as far as a potential limitation in the president's bargaining power, despite whites' liberalization about race and race-related policy issues.

The often misguided belief that the circumstances surrounding an individual are the default for everyone else.