Role play help

[chr999chr]

Looking a bit of help with a role play situation. I am on a course at the weekend which will involve actors being in my face and ranting on about how i am not doing the job quickly properly good enough etc. I have to stay professional and resist the temptation not punch their lights out.
I would normally match their rant with my own but i am in unfamiliar territory being the passive person.

Any one liners or suggestions how to help.