Present company excluded, there is a lot of truth in what Goldberg says.
Too many of today's "liberals", in particular those in the media, are putting a mean-spirited face on the persuasion.
And many people who think they are liberal actually have more in common with conservatives than with those who claim to speak for them.
I agree with you that political discourse in general has become more mean-spirited and hostile in recent years, on both sides. I'm sorry to see things deteriorate like this. It reflects the general decline in civility taking place in society at large.