What is your method to stop someone from shouting loudly at you ?

We have all been there. Someone is in your face screaming themselves hoarse at your expense.
My method is to take a step back and whisper a response.
Continue to whisper your responses. Stops them immediately because they need to know what you said.
They expect to drag you into responding by shouting. All they want to do is win a shouting contest.
If you do not shout your reply, they lose.
Very effective method of stopping someone screaming at you.