I am working in a consultancy firm for 2 months and it's my first job. From the first day I started working in here, I've found myself in office politics. My team is new and made up from 4-5 people. Our manager is ineffective since he does not know anything about our branch. He just sells the projects and he is not really interested about who does what. The problem is, the team lacks of discipline and work ethics. They show themselves like they are working really really hard and they stay up late at office everyday. They are stressful all the time but they don't just focus and work, at least, for 1-2 hours.
For once or twice I tried to say "let's get to work" in a sugar-coated way but they didn't like it. And someone, X, is a little experienced about this area. X scolded me for asking my colleague a know-how question about one of X's task. I warned X not to do this again in a clear way. But now, she is calling and telling me "You have made mistakes in your task but I fixed it last night" in a nervous way. She was supposed to test this in previous weeks, not just right before the User Acceptance Test! Her lack of planning, should not constitute and emergency or stress on me. I already escalated this problem to my manager, he knows this, they are constantly looking for new candidates but the projects should go on.
An expert just joined us for giving support for our projects and he is very aware of this problem. He helps me a lot in every way, telling me that this environment will change. But in the mean time how should I behave? I am pretty aware that they are backbiting me and sometimes I feel lonely but I don't want to hang out with them. I feel demoralized and tired most of the days. How should I work with them? Am I making a mistake for being blunt and explicit?