Inexplicable Chennai

So why is it people in Chennai love using expletives? From the autowallas who let go a drift of 'dai &#@$#$' at any fellow crossing their path to the morning FM station where two comperes greet each other with friendly abuses, expletives seem to have become commonplace in tamil parlance. Not that I mind, but I'm just stupefied that words which would attract offense in any other language have become part of colloquial speech here.