Right, there's no problem with saying something is on the left or on the right. The two observations I'm making is that what we consider to be the centre is relative to our culture, and that sites like media bias are themselves inherently biased.

For example, around 90% of young people in China identify with Marxism. So, what would be considered political centre in China would be considered far left in Canada. And this highlights how silly it is to rely on such labels when deciding whether a particular position is reasonable or extreme.