My current campaign's PCs are:
2 male Half Elves
1 female Gnome
1 male Halfling
1 female Human.
The adventuring group is totally unrepresentative of the demographic or political situation of the campaign world, which is dominated both ways by humans. I like them playing primarily non-humans, however, because it allows me to have racism as a recurring theme and source of adventure ideas. The humans of my world defeated the other races centuries ago. The Elves, Dwarves, Halflings and Gnomes live primarily on Indian reservation-like freeholds within human nations. In cities they often occupy segregated neighborhoods. Races like goblins, hobgoblins, and the like are either wild marauders or slaves.
Humans stereotype elves as over-sexed, impious (my elves are pantheists), unreliable, and lazy. Dwarves are seen as boring, greedy, stodgy and stubborn. Gnomes are considered tricky, and are rumored to be engaged in conspiracies to economically control humans. Halflings are considered rustic, gullible and ignorant. The PCs run into these stereotypes constantly, and dealing with the world as outsiders provides lots of good role-playing. In fact, I began the campaign with the PCs watching as a racist comedy was staged.
An yes, the non-humans get called things like "a credit to their race", and are told things like "some of my best friends are Elves."