There is no "necessarily" about it, but it's obviously how history ended up unfolding. The big cultural-media-pop conflict in the west this very moment is centered around acceptance of diversity regarding gay and trans folks.
People are bad with labels; diversity is associated with liberalism, which often gets conflated with a whole spectrum of other positions from social-democrat to actual Marxists (who tend not to be all that pro-diversity, depending on how "tankie" they are)