I work in a complex with several restaurants and shops etc. A "lady" comes in the same time every week in her work uniform and she is a downright completely rude bitch who speaks to you like a piece of crap and it really makes me fuming 
Yesterday she came in and called me a "stupid girl" because I asked her if she wanted milk for her coffee ?!?!?!
My friends at work want to go to the restaurant where she works and 'give her a taste back'
Half of me really wants to but the other half is telling me not to sink to her level.
Any advice?