This was actually a big revelation to me. Because in the beginning I would take people's arguments personally, even though it was about work, and cut them off from my "friendship" realm.
But I've realized as I grow older, that it was stupid. A friendship is not worth losing over one single incident of argument, especially if it was over some minor thing, which was most likely a communication issue. You can be friends with someone, and occasionally get into a huge argument. In fact, anyone in a long term relationship will most likely relate.
I've told this to some older people, and they've nodded and said, "you're starting to mature". So when I find myself at the receiving end of someone getting mad at me over a silly argument, and then cutting off friendship ties, I'm a bit surprised. Rather ironical too.
Another thing to note: since I don't really have strong family ties.. the really close friends that I do have, I treasure them and cherish them.