Yes, large swathes of the left-establishment sit either center or slightly to the right of average American opinion on several important issues, facts well known outside the fringe-right echo chamber.
They are rightly criticized for excess centrism on those issues. After all, the left is supposed to be, you know, left.
For obvious reasons, the fringe-left echo chamber is all too aware of this.
I have decided recently that I should not spend much time critiquing the fringes. They serve a necessary function, bracketing the discourse we that we actually need on both sides, maintaining the overton window.
What disappoints me is that the discourse we need is all too frequently drowned out by the howling fringes. But howl they must.