I know its tough… you are really annoyed… someone is trying to pull a fast move… blame your team… Whatever it is don’t rush in to attack – you want to get your point across – not explode – no matter how unreasonable they’ve been.
This article helps you prepare, think through your approach and design a way most likely to get your point across. https://hbr.org/2015/11/how-to-make-sure-youre-heard-in-a-difficult-conversation