I have told this story a few times.
It was my first day at a leftist college many decades ago.
I saw the guy in the room across the hall stepping out of his room.
I walked up to him, looked him in the eye, shook his hand and introduced myself.
His response (with a Charles Manson stare) was just four words:
“I am a Marxist.”
Yech, what can you do. Child of the devil.