I assume there is a desire to characterise sexism solely in forms of behaviour that sexists in this country don't typically exhibit,
So true.
I once knew a man who tried to use the sexist behaviour of other men to convince me he was not a sexist asshole. Thereby proving that he was, indeed, a very sexist asshole.
Took me some time to realize that his acknowledgement that women in, say, Afghanistan had it bad was not proof that he was an okay dude, but that he was just using it to justify his own sexism.
One very important point about "But the women in India ..." is that we cannot change what happens in other countries (other than by starting a war, which is considered rather rude nowadays, and I don't think a feminist party could get the majority of votes by promising to wage war on misogynist countries).
We can, however, change what happens in our own countries.
Sexists know that, and they don't want anything to change, so they like to draw attention to the sexism that happens somewhere else.