Unless you've agreed as a group, prior to starting the dungeon pulls at the entrance, to greed on items instead of need, there's absolutely no reason to follow these made up "courtesy" greed rules by other players on different servers. It's not rude nor is it wrong. Need button is there for a reason. You hit greed when you hope the person who's on that job passes the item and your lot is high enough against the others to get it.

You really want the gear, you go on that job or the class that can need on it. You don't want to wait in Q for a dps drop and go as tank for insta-q? Well too bad. The DPS that waited 45+ minutes in Q deserves to lot need on that piece of gear more than your impatient a**.

Don't get me wrong, I only hit need if I'm going to use that gear for something, I hit greed when I just want to turn them in for seals. I find it bit*hy when someone lots need to turn in for seals only but that's their right, they're on the need job - I'm not their moral compass on a game they pay money for.

Did the party need on stuff during the dungeon? If they did, they're hypocrites and they deserve all the GM calls you can muster for kicking you.