Mind you, Stargazer, it goes both ways. Not only extreme right wingers but also extreme leftists can be intolerant of other people's opinions (people like me, in the middle of political spectrum, going for common sense over ideology). As I gave in my example above, Germaine Greer is undoubtedly on the left, but whenever she talks about Australia it's negative (even now with a Labor female Prime Minister in power). Before, Greer made a few tasteless remarks about Steve Irwin a day or so after he died.
We all know the leftist taboos, eg. you can't criticise things like multiculturalism or the negative effects of secularism gone mad (eg. stopping singing of Christmas carols in state-run schools, or even mentioning Christmas or Easter). In other words, political correctness taken too far.
So I equally don't like these two extremes. Yes, when one is with these people, better to avoid topic of politics all together, and talk about mundane or benign stuff like the weather or what's on sale in the shops. You can choose your friends, but not your family and fellow students and coworkers, etc. We got to live with diversity, even at extremes.