Because your points about the specifics of location and cultural difference mattering in anti-racism are discussed by many anti-racists actually, many of them in the UK and USA, without such attempts to divert attention away from responsibility for white privilege by attacks on [still normalised white] US dominance of online voice.
If Alixtii tells me to stop discussing this here then I will because it is his journal, otherwise I don't see why the fact these things have been discussed before precludes us from discussing them again. Anyone who finds the discussion boring and repetitive is after all free to leave at any time.

I was not attempting to 'divert attention away from responsibility for white privilege' because I don't believe in the whole model of white privilege, the patriarchy, and so forth. Again, I don't see why that precludes me from discussing the issues to the best of my ability. I understand that people who do believe in the model and find it provides useful tools will be frustrated by my not believing in it, but I can't do anything about that.

I don't know what whiteness theory is or what specific things about Indian post-colonialism you are referring to.

I am as wary of stereotypes as the next person, but that does not mean that we can't characterise things about particular nations and learn useful things from the attempt.