Want your help guys.

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