Has that really been your experience? I think maybe you are making an assumption that just isn't the case. Most Jews I know either love Christmas, or are neutral about it. In fact, I never met a Jew who had a gripe about Christmas. When I worked at a local hospital, Jews were always happy to work on Christmas so that the Christians could have the day off.
Lets see... Xmas is about Jesus... Jesus was/is a Jew..
Jews killed Jesus.. deny virgin birth.. deny resurrection..
Actually I'm not sure about all these things myself..
Course you do have religious Jews, and cultural Jews..
even christian Jews, and atheist Jews too.. depends what you call a Jew I guess.. For that matter what a christian is, is quite a question itself..
as is, What is Christimas to be honest..