Imagine a situation: You give your girlfriend something expensive or something that you worked really hard for, for christmas. And she dont have a present for you, more than that, she dont even bother to say "Merry Christmas" to you. What would you do? Get upset? Tell her to fuck off? Or just nevermind that?
Shrug and remind myself there are plenty of other fish in the sea.
You can't really tell somebody to fuck off if the problem is a lack of them interacting with you, anyway.
Sure, you're out some money and effort, but to hell with that, who needs a girlfriend like that anyway.
If its a new girlfriend, I'd have my suspicions as to whether or not she was really interested in me, but probably let it slide and look for other signs of disinterest.
If its a long-term girlfriend, I'd tell her I thought she was kind of cold during Christmas and ask her if anything was up, without directly mentioning the gift. After all, she may have been unable to get one for me, or having a really lousy Christmas at the time, and have a hard time talking about it
Remember that she's Jewish, and apologize for my mental deficiency.