Long deep cleansing breaths.
I refuse to let someone who is obviously half mental dictate the type of days I have, nor the level of my inner, or outer for that matter, peace. I cannot control the behavior of others, no matter how ridiculous it might be. I would, however, like to remind them that whatever they do today, will come back to haunt them in the future. If they would stop for a second and look around them, they would see it is already starting. All I can say is that I will continue to pray for you.