Be careful to not be an arsehole. Specially towards people who have less power than you.
Criticise world views, ideas, and decisions. Specially the ones of people who have more power than you.
I feel like this gives it a more nuanced view. It's fine to criticise the worldview of someone less powerful than you, but you need to be extra careful to not be an arsehole. Similarly, it's also fine to be civil towards people more powerful than you, but you need to avoid being a fool manipulated into doing their bidding.
(It doesn't sound as cool as "always punch up, never punch down" though.)