Is " EXCUSE YOU" proper ettiquite?

I live in new york and ride the subway to work like over 2 million other new yorker. i swiped my metrocard to enter the station this was at 6:30 in the a.m. on sunday. no sooner i cleared the turnstyle i came to a complete stop to put my card away when a lady said loudly " excuse you" amazed at the statement i turned around and smiled as if to wait for some sign to indicate that she was only kidding. well there was no smile and even anger in her voice as she walked onto the platform. even though there were two other turnsyles she could have used, i know and recognize that i was in the way, but is it proper to use that term in an sarcastic tone?