Want your help guys.

What do you guy say about this kinda guy ..
Here:
i was sitting alone on stairs ,
writing something then , one guy came
(i don't know who he is ,i never saw that guy arond )
said :
guy: i'll hit you i left him at once ..
and guy shout at me !
I Gonna Hit You!! You want some!!
and I said :
I punch you too.
he: you have dare!?!
i said: yes, if you punch then after that i gonna punch you too..
He: Don't mess with me .
We Are Guy ! I CAN DO ANYTHING .. (i know what he meant by that)
why some guy act like this?