"Man" as a nickname

"Hey man, what's up?"
"Yes i am a man. Representative of that which we call 'mankind'. Another cog in a 60 million year evolutionary machine. I have only the most superficial of differences with Napoleon, Hitler, Tutenkarmen and Nicolas Cage. I think and walk freely. My mind and thumbs oppose. I live in colony of us creatures. I am man. All my brothers and sisters are also man. I am a speck of dust in an infinite cosmos. I am to the universe as the entire mankind is to the universe. It's like the difference between 1/123456789 and 1/123456788. Nothing."