townie attacked my sim without provocation? why?

I just had this happen today in WB, my couple was outside taking a photo together in a public place when out of nowhere another one of my sims gets into a big fight for no reason with the wife, the wife won the fight, so I thought the other female sim would leave but she stuck around talking to the husband for a little bit, I guess the conversation wasn't going well because he started a fight with her twice. It was rather funny to watch, now they both hate this woman with a passion.