That probably won't happen easily because you do have racists who'd like their lineage to stay one color. There's also the fact that depending on where you live your skin will change ( Tanner near the equator and vice versa )
Plus, it's really stupid to force people to breed with someone purely because of their skin tone. Even then people will find things to separate each other with, like with black people ( at least in the US ) making it light skin vs dark skin
And you can't just kill someone for being racist
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As for the racists?
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kill them.
And you can't just kill someone for being racist
Like the features are so unique