Because you're so macho, right? And anything you don't understand shouldn't be used.
[EDIT] I find the sample code quite readable -- as long as one understands that it does more than constraints in that example, and that you of course have to read on the symbols to get them, like you'd have to read on Ruby's @, C's * and &, on regular expressions, etc.
But this macho talk from "team leaders" I dislike.
What exactly does it try to prove, even "metaphorically"? That the leader is so arrogant that wont discuss but bully his team? How about we reverse it: who would want to work in a team with some slap happy lead? Who'd want to hire that team or acquire that "talent"?
(And would this talk help the IT industry attract more female programmers?)