Hope you enjoy your festive fun. Depending on where you are in the world and how you celebrate it (many Europeans celebrate it at the evening of the eve) may it be enjoyable and the food be plentiful. If you're very poor and the food is barely available, that is a great shame.
If you don't celebrate it, that's cool but I don't get this BS 'offense'. Nobody would dare go to Middle East and say 'call your Eid celebrations 'X mubarak' nor would Ramadan ever be renamed 'unislamic fasting'.
Christmas was jacked from Scandinavian Paganism and turned into a Christian festival, enjoy it and if you don't celebrate it either enjoy your excuse for family time this late December or get hyped for New Year's or treat it as any other last week of a month and try to make the most of it.