I didn't see last week's episode cause I stopped watching the Simpsons - to me it has become unwatchable. But the Australia episode you mention did anger a lot of Australians, if I'm not mistaken. An even better example is the episode with the "Streetcar" musical. The city of New Orleans demanded an apology for the song "New Orleans," with lyrics like
New Orleans: home of pirates drunks and whores! New Orleans: tacky overprice souveneir stores! If you want to go to hell you should take that trip to the Soddom and Gommorah of the Mississip-- New Orleans!
Several episodes later Bart wrote on the chalk board in the opening theme "I will not apologize to New Orleans"
So those of you who can still stomach the show's shoddy writing and derivative plots, keep an eye out for what Bart writes on the board in the coming episodes.
"...let my children hear music - for God's sake - they have had enough noise." Charles Mingus