There are multiple forms of cultural Marxism. To seek to make everyone the same culturally. Do not grade demons by their evils, lest you be tempted to ally with the least of them. "If only we were all MY culture" is cultural Marxism, the same as their declaration of the exact same words.

Your culture may be superior, but it's still advocating for a regression to a singular norm, cultural marxism. They need to be free to be wrong. And likewise, you need to be free to point out they're wrong.