the.com/chauvinism

means An exaggerated, unreasoning devotion to one's own group — originally nation, now stretched to gender and other loyalties — paired with contempt for everyone outside it.

from Named after Nicolas Chauvin, a (possibly legendary) soldier of Napoleon's army whose fanatical, undying devotion to the emperor became a stock joke on the French stage in the early 1800s — the exaggeration itself was the punchline. The name stuck as a byword for excessive patriotism, and by the mid-20th century English speakers had widened it to 'male chauvinism,' extending the same blind, puffed-up loyalty to gender rather than flag.