There is nothing inherently leftist about feelings of moral superiority. It comes with various ideologies and is poisonous all the same. I can only recommend Altemey's excellent book on the topic. (By the way, my short definition is that if want to reduce social injustice and inequality, then you are a leftist.)

In fact, yesterday I just had a debate with my Czech coworkers (we work for an American company). In Europe, the ideology of "political correctness" is not so followed (and in fact many from minorities would find it plainly annoying), and in Czech Republic specifically is mostly ignored. Yet in many respects Europe could be considered more "leftist" (take employment law, for instance).