Anger shrinks your options down to one. Wait an hour before you send anything.

Anger is efficient and extremely narrow. It presents one course of action, insists it is obviously correct, and hides the four other things you could do, which is useful if something is charging at you and unhelpful in a group chat. An hour is usually enough for the other options to come back into view. They were there the whole time.

Make the hour a rule rather than a decision, because in the moment you will not want it. Put the phone face down, go somewhere else, do something physical. If it still needs sending afterwards, it will survive the delay and read better.