Good question, depends on "how" they go about it of course but generally unless they do something to seriously provoke me I do my best to just carry on and avoid them, minimize contact as much as possible and also stay focused on the things in my life that are good and that I'm grateful for. If I really need to "vent" about it then my feelings about the situation will often be expressed through writing poems.
What is something positive that you like about yourself?