They are always harassing each other, partly for amusement, partly to score points in the eternal dominance battle between them, but also partly to see what the other guy will do if he is subjected to social stress. It’s part of the process of character evaluation, as well as camaraderie. When it works well (when everybody gets, and gives as good as they get, and can give and take) it’s a big part of what allows men who work for a living to tolerate or even enjoy laying pipe and working on oil rigs and lumber-jacking and working in restaurant kitchens and all the other hot, dirty, physically
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