Or, on the other hand, perhaps you're talking to someone who has
nothing important to say, and just keeps
blabbering on and on, not allowing you to state your
point of view, and
interrupting you whenever you do get a chance to say anything.
Frustrated with their
stupidity and
inconsideration, you keep
raising your voice louder and
louder to be heard over them, but they just won't
shut up, because they're used to having
yelling matches such as the one you are currently involved in.
A more generally applicable axiom might be: "If you have to scream to be heard, then the conversation you're engaged is not going to go anywhere and will not convince anyone of anything, so you should walk away".