The job of a driver is very demanding, very difficult, and very frustrating at times. Management will wring you out and hang you to dry every chance they get. The attitude you see is a self-defense mechanism.
Most of us work hard, do our best, and take pride in what we do. Management will force you to work in blizzards, try and get away with sending you with unsafe vehicles, try and short your paycheck. Try and pit employees against each other. They are manipulative and vultures. You learn to be sceptical and watch your back. Hope that helps.