Other then maybe a "Hold your damn line" or something like that, no more is needed. Trying to start a fight like that is childish and DQing is just fine. However, foul language is ok, as long its not directed towards someone in an abusive matter. I've yell "oh damn/sh1t" when a big rock gets picked up from a tire and only misses my face because I move my head real fast or something to that nature. If its something like that, I think that is rediculous.