On Christmas, the pope blesses everyone in the world. The Dalai Lama routinely blesses everyone in the world too, as do major religious figures in every religion. Sandra Bullock, as Miss Congeniality, wished for world peace. A blessing is simply a human being wishing well for other human beings. Why would I be offended by any of that?
My race is Chinese. I'm born in Singapore, a multicultural, multireligion society. Since birth, I have been exposed to various schools of Buddhism, Taoism, Christianity, Hinduism and more. Interfaith religious celebration on Babylon 5 may be science fiction, but here in Singapore it is a real world fact. If you like, have a look at this wikipedia article on freedom of religion in Singapore. On every major religion's holy day, there is usually a few interfaith religious ceremonies being conducted jointly by pastors, monks and priests. At least for myself, rejecting a blessing simply because the person giving it is from a different religion... well that's a form of discrimination that is as serious as racism.
I'm not "rejecting" anything, just saying it was too narrow. Of course I'm all in favor of interfaith celebration, but that's just my point -- this wasn't multicultural, it was saying that one culture's particular mythology and calendar were the only correct answer for the entire world. And I find that unthinkingly ethnocentric, no matter how well-intentioned it was. If this guy is really a global spirit of goodwill, then he shouldn't release that goodwill only on December 25, but on every culture's holidays of renewal and hope. Granted, a lot of cultures have winter solstice festivals, but there's a fair amount of flexibility about the actual date. And the Chinese New Year is generally in late January or February. I'd rather they'd said it was a whole season of renewal rather than being December 25 exactly. Or that Santa was just one of multiple mythological spirits of hope and goodwill, rather than the only one. It's a basic question of inclusion, of treating the West as just one culture out of many rather than the only one that gets it right.