GP's point was just that a sweeping generalisation of "the modern Left" is a meaningless statement, because it doesn't address a well-defined group, and the Left generally is not similar enough among itself for those broad claims to be true. Representing an entire swathe of the political spectrum as one homogeneous group is completely dishonest and unrealistic. It's definitely not "pointing out a trend".
But if your group is so wide that people so different as H.Clinton and Chomsky could be inside it, and you talk about their motivations instead of a specific idea, I think you deserve some criticism.
I think it is more like saying:
"The modern Right is dripping with hatred for the Government - quite ironic given that we live in one the most free, prosperous societies ever created in human history. They are driven almost entirely by resentment, and lack even a shred of gratitude for the vast wealth, comfort and freedom they've been born into."
You could ask me, and rightly so, who is this "modern right" and if I'm being fair when addressing their motivations.
You could ask me, also rightly, how the debate advance in a positive way with this kind of all covering statements.