Is that not the very definition of democracy? Majority rule easily and frequently overrides and marginalizes minorities. Its kinda the point.
Of course specific minorities have gained mind-share over the years with the majority, and thus become "in the majority". Usually this takes the form of a growing acceptance that others, although different, are still people.
Women have had the vote for barely 100 years. Civil rights. Gay rights. Marriage rights, and so on.
It seems like every era brings a new fight, a new minority to hate, fear, ignore, accept and embrace. The old-guard has a moral panic, wails about their "way of life", but alas they are the minority, so eventually get shouted down.