I thought the point was to demonstrate you're not being violently aggressive [with your voice at least] and to get the person to have to pay closer attention, ie move in, at which point they risk escalating too much if they continue being very loud.

This to me is a defusing technique rather than an attempt to increase the other persons anger and to humiliate them.

Guess it depends on what you want to get out of the situation: you could adopt a quiet voice and non-threatening demeanour but be highly offensive with your language and probably achieve the ends you mention quite well.