No, I'd agree with you that a fair number of Australians are
ignorant of foreign matters, even their journalists. On and off
I've complained about Mark Baker, Southest Asian editor for The
Age, not being able to get his facts right. Contrary to your
assumption, I have no trouble telling Australians when they've
gotten their facts wrong - if you're wrong, you're wrong,
regardless of where you're from. I have in fact written in to The
Age to highlight all of Baker's errors in his articles and
questioned why they have such an obnoxious, ignorant redneck as an
editor. Oddly enough, they saw fit to refrain from printing the
letter. 
However, if you choose to make a point, you owe it to yourself to
check your facts first. No sense making a stand when your pants are
down, is there? Unlike the 95% of Singaporeans who have chosen to
not talk about native title and apologies, you have chosen to
comment on the subject. If you don't know about it but still want
to talk about it, that's where the ignorance comes in.
By putting forward your "how am I suppose to know" defence, you've
successfully negated your own excuse of sarcasm. After all, if you
already knew the status of the apology situation, why bother
drifting into the topic of not knowing because you're in
Singapore?
