Seriously? LLVM supporting minorities means that you have to leave? I cannot fathom how trying to be inclusive should matter to anyone - it does not diminish you in any way to offer a hand up to others.
I work in games. I have never been to GDC or PAX while I have seen many women get funding to go there on the basis of being a female in games. That isn't an attack on me personally - it's an attempt to work against historical inertia. And it's great. My industry needs to change and we are better for having a broader range of voices heard.
If this guy thinks that helping others is such a burden, then really, I struggle to muster any sympathy for him.
The writer of the post is part of a minority group.
Note that encouraging minorities to contribute and excluding majorities from contribution is very different. As he said in the post, the latter is what he was concerned about.
So from what I gather, the developer is leaving the project because LLVM is involved with a project that offers paid internships to women/trans/genderqueer and racial minorities?