The difference is that Brietbart isn’t just right leaning. It propaganda for fascists, and a machine of hate, targeting the mental inept.
If you dig into either source, I think you'll find a lot more in common along ideological lines than liking pants.
The definition seems to have changed these days. I think it's a mistake. Liberals had higher ground when they allowed every point of view to make their case and thrive or die on their merits.
Funny. I would have said the same about nearly every primary left-leaning media outlet.
It’s ignorance like yours that keeps progress back. But whatever...