Q, i think it's both. If someone didn't read the novel, they may get the impression that Vito is an easy going guy who just happens to have alot of friends. I think that scene establishes that there is an element of his personality that asserts aggression when that aggression serves a purpose. I think it also establishes him as a man's man.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
