That left wing politics (eliminating hierarchy) is about ensuring that people are treated equal which means that groups aren't subjected to hate. It also means that certain lives aren't valued less than others.
Liberals don't give a damn about people, they only care about demographics. They have no problem with hatred and prejudice, they have no problem with assigning less value to someone, as long as the targets are approved by the hivemind and not on their "groups we care about" ranking sheet. They're every bit as biased as conservatives, they're just a hell of a lot more self-righteous and hypocritical about it.
I really could not have asked for a better example than the reply below. I think for a lot of people, this kind of arrogance and conceit is what defines the term "liberal" and why many who might otherwise be left-leaning in terms of philosophy do not want to be associated with them and grow in the opposite direction.
Just tagging so I can keep an eye on you crazy southerners.