Speaking as an agnostic,this kinda gives me brain freeze. WTH is wrong with these people? Yeah,Christmas is a religious holiday TO THOSE WHO ARE CHRISTIANS,but it is just a very nice family holiday to those who aren't. AFAIK,there are no laws REQUIRING anyone to attend religious services on Christmas day,and AFAIK,everybody gets the same holiday days from work,regardless of their religious beliefs or lack of religious beliefs. NO DISCRIMINATION against non-Christians. None. Not even attempts to shame them for not believing.
You have to really love getting pissed off if being pissed because someone else is happy is the best you can come up with. Either that,or you are an attention whore,and will say and do anything to attract attention to yourself.