Corrected someone's grammar in a group chat. Now he wants a fight at the end of the day.
:/
FML

Happens a lot with me :/

You're missing a full stop at the end of 'FML'.

Say that you will hack him if he will hurt you

Yeah tell him you don't wanna fight but if he hurts you you will hack all of his family Facebook accounts.

I believe you are missing "I have" at the beginning of the post.

Inform him that you take umbrage with his substitution of violence and barbarism for intelligent discourse, but are regardless inclined to acquiesce with his request. Then beat him senseless with an English textbook, or barring that, the dictionary.

Tell him you don't want to fight, and then if he doesn't ask why say "you know why I don't want to fight?" (at this point try to make yourself look unstable/insane) "Because if we fight you're gonna kick my ass, and the humiliation is gonna turn to anger and revenge. and I'll just have to come back and SHOOT you"

*disclaimer* following through on empty threat not advised.