A Little Respect Please

I was going to walk up to the house today from our temporary apartment. But by the time I got halfway, I realized walking 20 blocks might take more time than I alloted today for leisure activities (that and the stone sample bag I was returning to our architect firm was a bit heavy). So I jumped on the bus. Which, means I utilized public transportation on my way home too. As such, I was treated to a very loud and obnoxious phone conversation, filled with curse words, by a woman who had no respect for those around her. Who taught these adults manners? And is it wrong for me to want to address their impoliteness now - hopefully educating them in the ways of common decency?