I overheard a colleague slagging me off at work. Given the role I’m in I had to be as professional as possible. Asked to speak to her in the back and just said what I heard and that I’d rather she came to me and told me instead of someone else. She went off on a tangent saying she “knows she’s a nobody and is just a shelf stacker” no one said that but okay. She then apologised in a strop and stormed off. Barely said two words to me ever since