Seriously? I can't believe this! This crew should be fired, this is my honest opinion. If I was the manager, I would check the passport just to make sure this person is really older than 21 (behaviour says this person isn't a grown up), plus asking whether she/he lied in the interview when she/he claimed to be a teamplayer and loved working TOGETHER with other people (and not backstabbing them).
My friend is working at the other big E-airline in the Emirate which you are asking about GSA, and yes, things like that happen every now and then there, a bit more often than in EK. In my 18 months I never experienced such behaviour though, luckily.
They/we get their behaviour from training college. We've been told to report everything we see which is not according to company standards or rules and regulations. I think it is necessairy to report shortfalls in safety and security, I did it once, but I still went to the SFS first to tell her that I have observed her NOT doing her security checks and I expected her to say she was going to do it immediately but instead I got a reply like: you have NO idea how hard my job is and I JUST don't have time to do my searches

Really? So my conclusion was she never did her searches and went to the Purser who reported her later. I know myself time is often to short but we always can ask for more time, the more often we do it, the better the chances that we get a bit more time in the future.
I had a Purser once giving us more rest than needed (same situation, night flight, fairly empty). He said: "I would like to give you all xx hours rest instead of yy. Anyone here not ok with this? Good because If you accept it now, and going to report me later, we're all going to be a team, we're all saying we only had yy hours rest and you will be the liar - don't risk it. Good night ladies and gents"