They kept showing Rob talking about how he's not a team guy, and he really seemed like a jerk. But when his teammate Matthew blew a the strike challenge to give that team its third strike he sat Matt down, told him not to worry about it and said his career isn't going to be decided by one challenge. He said that when he knew at most one of them would survive elimination day. I think in the interview process they get everyone talking for a long time and choose interesting stuff to show even if it's not an accurate portrayal.
That's the case with every reality series. Bottom line is the producers don't make this stuff up (at least not usually), Rob said these things on video so he has to own them. Of course the producers do some creative editing so the contestants fit a certain role within the show, but more often than not, the contestants personalities make it easy for them to do so.