Why is Shouting So Socially Acceptable in Israel?

Sometimes I will be talking to a family member and they're just YELLING in Hebrew. I will say calm down and they will say, huh I am calm. I go to the Super and someone is just YELLING at the cashier and everyone is like, yeah, what's wrong. I try to cross the street and someone YELLS YA MANIAK and honks the horn repeatedly. What's the deal?