Wyrmshadows
Explorer
I suppose it's a turn-off when it feels entirely forced, either as part of a conscious agenda or simply from a narrow 21st-century American (or British, Aussie, etc.) worldview.
I must admit, it feels particularly odd to have a "white" halfling next to a "black" halfling, or whatever. (Together, they fight crime!)
LOL

That is funny
Forced to me would be an art layout with a black man in a samaurai outfit, a white woman in a Native American outfit, and an asian in a traditional African garb.
Cultures are different and they are often rooted in ethnic identity the regions of the world from which those ethnic groups hail. Thank god they are different. In my fantasy I don't want a gigantic world-spanning "human" culture that is a monolithic entity in the name of diversity because ironically that would destroy all the real diversity of the human race as the expense of PC diversity.
I don't want humans to suffer the same fate a the non-human races of fantasy. Talk about monolithic and dull cultures. Dwarves love mountains, elves love the woods and halflings (recently) love rivers. This would make sense if these races were extant only in a given region of a setting. However, as it stands dwarves, elves, halflings, etc. are what they are no matter where they are in the world in traditional D&D/Western fantasy.
I would like to see elves that love the desert the way their kin in the north love the forests...ah, I found them...in my campaign setting.

Wyrmshadows