I will also say that in an informal setting among friends, "dude!" with a certain tone is used to express surprise or dismay at something that a man has done/said. I'll give two examples.

Person 1: "I found out today that I got the job."
Person 2: "Dude! That is so awesome."

Person 1: *drunk and knocks over a glass during a party and is becoming a bit aggressive"
Person 2: "Dude, chill out."