TO WISH SOMEONE
1. Merry Christmas
2. Happy Chanukkah
3. Season's Greetings
4. Happy Kwanzaa
5. Happy Holidays
6. any other seasonal greeting that I can't think of right now
If someone cares enough to wish you a "happy holiday", please don't give them a lecture about how it is a crime to say "merry christmas" nowadays.
If someone wishes you a "merry christmas", please thank them and take these lovely seasonal greetings in the spirit in which they are intended.
None of them was EVER meant to be an insult.