A lot of it is pardonable as the world genuinely has moved on since the norms of some older people were engrained. What for our generation may be completely unremarkable - immigrants, gay marriage, secularism - are for some older people really quite radical concepts that they may not understand, let alone embrace. I suppose older people are predisposed to tend towards conservatism, in that regard.
Some of it is just relativism and the ever-shifting vagaries of the euphemism treadmill. Reading smearyllama's post above is a case in point: I hadn't realised that "oriental" was considered politically incorrect, and hopefully I'm not some belligerent old fogey. It literally just means "of the East", the counterpart of occidental, and we don't hesitate to call ourselves Westerners, do we? But hey, if somebody out there has decided that it's now an offensive word, then I guess that's cool with me. But you can see how easily unintended offence can be given. It's the whole black/coloured situation all over: which one is the racial slur and which one is the polite and progressive euphemism? Let's see, it's 2013, which isn't divisible by four, and the month has an "e" in it, so that means... *holds finger to wind*
And then again some old people are intentionally bigotted and abrasive old c*nts who feel they can say whatever they want and not get called out on it because of their age. Some of the rudest and most childish people I've ever met have been senior citizens. For these people, I say look on the bright side: they'll be dead before us.