Cultural Marxism has been more successful than its economic variant. One can only conclude people dislike having to share things, which is what is promised by socialism; but they are attracted to the idea they can do what they want without being bound by anachronistic social mores and conventions. I dare say hedonism that is writ large in Cultural Marxism has far more adherents than socialism.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus