There is nothing wrong with a season's greetings, however we don't do this for spring, summer, or fall. It's only used to cover over someone else's revered holidays. I'm not Jewish but happy Hanukkah would not be an offensive greeting or goodbye to me, as long as a merry Christmas was a respectable response. Take it a step farther, it's July and you say happy 4th to someone, and they say happy summer in return. Are they really trying to say have a happy summer, or are they trying to marginalize your recognition of a holiday. (You may not be American but I think you get the point.) By the way, I am finding some of the back and forth in some of your posts interesting. :)