It sure can be frustrating when someone acts like that. I think we all would love to be able to get them back and have it be the last word kind of thing. But it will never happen that way.
I learned a long time ago that when being subjected to that kind of person, the less attention you give, the less fun it is for them and they move on to someone else. As hard as it can be to hold back and not play their game, it's really worth it in the long run.
Sorry you have to go through this. Wish you luck on ignoring the flippin maroon