belief in the superiority of one’s own particular group
chauvinism - bias
‘Chauvinism’ is used to express a strong and generally unreasonable belief that one’s own country, race, sex, etc. is better or more important than any other. This belief is usually expressed in a boorish way. Today, the word is most commonly used in relation to men considered to be sexist.
National chauvinism is very prevalent in that country, which is why they are such a threat to world peace.
Daniel is a dinosaur and a chauvinist. He doesn’t believe women belong in the board room of a company.
Robert was just trying to offer Alice advice, but she considered his repeated interference to be chauvinistic.