I do disagree.
Political correctness is the ruination of American society.
For the sake of "progress" and "liberty", we are now being told how we're supposed to feel (or not feel), what we're supposed to think (or not think), what we're supposed to do (or not do), and what we're supposed to say (or not say) in any given situation.
SSM is yet another "politically correct" thing that we are now expected to embrace for fear of being castigated by the left. Who, ironically, are much more closed minded than those people they oppose for that very reason.
So no, this does not sound like society is better off by this.