I think that it's pretty obvious that the user that you're responding to is using the term 'homogenous' as a euphemism for "white"
I'm not - not everything is about race. That's a pretty basic lesson that World War 2 taught us, that you should have learned.
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Then they should say white. I'm prepared to give a lot of leeway when conversing with non-native speakers but as somebody who has grown up within a culture that understands that the concept of cultural homogeneity cannot refer to native speakers of non-mutually-comprehensible languages or historically antithetical religious positions, if they choose to use the word in novel ways that's their problem not mine!