How to respond to the "xmas is pagan/inclusive" argument

It seems that anytime I mention that it’d be nice to see some Chanukkah representation, people LOVE to tell me that “it’s actually pagan.” As if that makes it all okay that only Christian holidays are recognized (US).

I have tried to explain that that is not the point! This whole pagan thing is not some big revelation that will suddenly make myself and other Jews and people of non christian religions feel included.

I can’t explain how frustrating it is to deal with this ignorance. How do you get through to your christian friends?