Programmers Don't know how to Test

> If you ask developers about equivalence class or boundary testing, I bet you you half of the programmers have absolutely no clue what those are and the half that have heard of it cannot use it to save their lives.

On the other hand, if I asked a random tester about AST or vector clock, he wouldn't google his way out of a paper bag. Why would one expect people to understand something from only barely related field?

Why is it always the bad programmers that badmouth testing and the good programmers actually praise their testers?