Depends on which circle. The most prominent circle - the Holy See - has been demonstrably quite affable toward Protestantism over the past two generations.
The fact is, ZC, the circle of fundamentalist Protestants on FR has been pretty unrelentingly nasty to Catholics on FR for the past decade - and they seem to especially delight in pushing the buttons of Catholics in a deliberately trolling fashion.
If my only knowledge of fundamentalist Protestants was what I learned on FR, I would have to conclude that they are as honest and principled and charitable as the average Muslim internet troll.
The witness of the Biblical fundamentalist contingent on FR is almost uniformly disedifying.
If all rural Bible Christians in the US behaved as they do, they would deserve to be a reviled minority.
However, having spent plenty of time in the American South I know from personal experience that they are - in general - far more decent and morally upright than many of the crew on FR that purportedly represents them.
It's a good thing that Catholics never push Fundamentalists' buttons, say, by constantly defending evolution and restricting Biblical inerrancy while flaunting every alleged post-Biblical supernatural phenomenon in history. Or (say again) by calling them "Cletus," "Billy Bob's Glory Barn," and "brain dead bibliolators" while swooning at the "simple childlike faith" of illiterate peasants who believe some saint lives in a local well. Nope, no button-pushing there.
If all rural Bible Christians in the US behaved as they do, they would deserve to be a reviled minority.
So . . . condemning Protestantism from the Right is a no-no for Catholics? It can only be condemned in the vocabulary of an Ivy League liberal?