Big difference: We used to all wish one another "Merry Christmas". Even my Jewish friends would wish me Merry Christmas. But now, it's taboo to say that. The ACLU can get a restraining order against you for saying that at work or in a public place.
Everyone wants the legal holiday, but nobody's allowed to refer to it as Christmas. But the next day, December 26th is Kwanzaa. So now instead of wishing everyone Merry Christmas, we CAN wish everyone "Happy Kwanzaa", and still be politically correct.
HAPPY KWANZAA