Vaughan tends to shout louder than everyone else in a room and likes to have the last word.  I doubt he said anything of a sexist, racist or ageist nature too but he took this woman to task for something while she's in a bus seat and he's towering over her in the aisle.  When you trap someone that way it might be perceived as bullying and then it doesn't matter if anything "ist" was said. I can see how Wong felt intimidated.  Vaughan apologized so it's time to move on.