Don’t say it.
Just don’t say it.
You never regret not saying something in anger. Saying it will only ruin it. You’re working on something bigger than whatever you’re mad about. Don’t say it, yell with your mouth shut. As a tiny little Irish rock and roll band said, "Scream without raising your voice".
For that matter, think of the things we never regret...ever hear anyone say, "I wish I spent more time at the office." or "I wish I had had more to drink"? Hmmm.