@Shlomo It's easier to drag someone down than to lift the other up. Try it even literally / physically with a chair. It's also true philosophically / mentally.

Lowest common denominator is . . . COMMON to even those who can acheive more.

It's the easiest way to find commonality. Some adults try to talk down to kids with baby talk and silly words because they think that's how they will "connect" with them.