This mistress realized that it was one of her closest colleagues who had betrayed her and she did not like it. She had to do something about it and she chose to use her spit to express her disgust and displeasure at what her friend had done to her. The mistress even asked her friend to help her do it and the two of them had a great time degrading him.
This guy was rude to these mistresses because he wanted to get under their skin and piss them off. They watched him and waited for him to get fed up with what he was doing and go away but he did not and they were pissed. They got pissed when he went on doing it and that is when they chose to torture him which they did with their spit.