I don't find it racist at all, but tweet seems poorly explained, and isn't very obvious to those not understanding of racial issues or are part of the black community.
The black community has been and still is plaqued with self hate, steming from slavery that has been deeply ingrained to this day, its easiest to see on a scale of media representation as lighter skinned or mixed people to be pushed to the top of black representation as their deemed more attractive....but these issues arent as simply explained there are layers and years of conditioning involved.
the tweet itself can be easily interpreted in a contraversial light as it lacks context.
I took it as a promotion of black love and self love, which is somewhat needed.
At the end of the day people have preferences and can love who they want, be it the same race or not, these things shouldn't really matter, but racial tensions are still high.
Admitedly though, the mixed side of tweet reminded of the breeding program they had put aboriginal slaves through in order to breed the blackness out, this image was essentially what the program was..although they kidnapped the children...
The idea was the more white you have in you the more status and attractiveness you held (the idea still stands for some subconsciously sadly) , similar to that of the heirarchy between field slaves and house slaves, alot of lighter complexion became house slaves and were favoured (although they were product of rape in most case and the cycle would continue sadly)... But the colour divide that stemmed from this still exists, be it consciously or not as does the self hate.
I waffled a bit there sorry lol