Actually, yes it is. Even hate speech is protected in the United States, a country which models freedom of expression for the world. As an American, I’m free to say that I despise the culture that continues to thrive in, say, the camps full of ISIS members being held in Syria. No one gets to hush me and advise me that it’s an illegitimate form of expression to despise sex slavery, the full body veiling of eight year old girls, routine beheadings.
An extreme example? We would all condemn such a culture?
Well, but then you don’t actually believe the expressed loathing of a particular culture is out of bounds.