Christian Crybabies, Jewish Jabberers, Moslem Mouthpieces, Hindu Hardtalkers? Really! Give me a break. Courteous people of all stripes don't want to offend anybody, and temper their statements where appropriate in most situations.
If what is being spoken of is the Canadian tradition, of being able to express it without somebody raising questions as to whether it might not recognise some other traditions, then so long as such reflection leads to thoughtfulness and politeness, there is nothing wrong with it. It such discussion is meant to lead a rigid prohibition of certain forms of well meant greeting, then it seems presumptuous to me.
In case it has escaped anybodies notice, there are, so far as I know, two, separate but interrelated celebrated Christmases in this country, the temporal(Shopping, Winter Festival, Santa Claus), and the religious(Jesus, Birth of Christ, Promise of Salvation) The temporal one ought to be offensive to no one, and public utterances should be considered to be relating to this one.