I remember being 20 years old and no, I haven't been calling people "dumb fucks" in private conversations; to the contrary, I ran a small website on geocites in 1995 (if you don't know them, google it) and was super-happy when I had people commenting on it. Last thing my 20-year old would call them was "dumb fucks" for merely entertaining with my site.
Saying that Zuckerberg is a sleazebag based on a snippet of a private conversation he had 15 years ago when he was a college student is a stretch.