Only this time, the guy is serious. As a human being, you normally can't because you are ruled by emotion. Unfortunately, some business owners allow owning a business to go to their heads. That's why it's even more important to stop and think again. If you allow it to go too far you could lose your business entirely.
Egos are a very tricky thing to deal with.
Rage does nothing but tear you up emotionally inside and always erupts in bad behavior and lost relationships. Never, ever, go into a rage over the phone. If other people are screaming at you, you will either calm them down by remaining calm yourself or show them up for being emotionally unstable. Rage is truly the result of an unstable personality trait. It's really NOT normal.