You know in reality, retaliation is something simple, in league it's different.
Reality = Someone punched you, you deck them and walk away. (Or get them help and explain the reason they're knocked out is they're and idiot/)
In league though people don't react in the same manner, they just do an eye for an eye.
What you CAN do (Someone starts flaming you. Simply state "Shut the fuck up" then DONT say anything else. Seriously if thats ALL you say, you're not gonna get in trouble. Believe it or not they DO read logs. You're perfectly in right to tell a flamer to shut the fuck up then ignore them.) However stooping to their level is not. Think of the other players who are annoyed at you for typing instead of fucking up the enemy.