People who curse on and on in inappropriate places do it for the shock effect, they know it's not appropriate so it serves as an attention getter and, in their minds at least, more intimidating or in control, which is why of course excessive cursing appeals to juveniles so much. What they fail to realize in their small brains is it attracts the same sort of attention as walking around with a wet spot in the wrong place on the front of your pants. The vast majority of people see them as the idiots they are.
Just one of those things that seperates the men from the tards. Let your son know that.