The day my chivalry died

I was riding home on the train yesterday and this guy sitting next to me starts telling the lady sitting across from us that she needs to uncross her legs because it's turning him on... I take my headphones off to see where this is going... then he tells her that she might as well just take her clothes off for him. I see other guys standing around, and an older lady too, and I think in my head that this could be a real new york moment... If I speak up, they'll all speak out too. So I say, "Dude, she don't need to hear that!" and i shock myself with how ghetto I've sounded, but I don't let it show on my face. I look around expecting to see the other guys ready to jump in with me, but they look indifferent. I look to the girl whose aid I have come to... she too looks indifferent. I look back to the guy sitting next to me and he says "Stay outta my business." So I say, "just leave her alone, she don't need that." Then the train stops, the lady stands up, looks at the guy, says "Fuck you" and walks off the train. Everybody else is acting like nothing's happened so I put my headphones back on. The guy then starts talking to me, but I can't hear him because of the music. All I can make out is something about his business. So I take my headphones off, mad at him, mad at the other guys standing around, mad that my chivalry was not noted, and I look at him and say "Seriously?" and I put my headphones back on and go back to reading. The guy got up and walked away through the train.