Yep, that's the bro code.
Anything on the tree is fair game.
On the ground under your bar, maybe not. Ask first.
On the bar: This is Sparta!!!!
I don't mind people taking weights off the squat rack while I'm using it, but I do get pissed off with people loading the rack up with shrapnel so that I have to unload to get at the "real" weights. Take all dat chit over to the weight tree you fukka. No squat rack needs more than two of any weight, unless they are 20's.