I am sorry you feel bad about the warning. But understand that is just a warning to let you know that using the type of language you used is not acceptable on WarLight. I took a look at what you said and I agree with the warning -- those kind of profane insults are not welcome here.
I understand that perhaps the other player was saying mean things to you first. However, this doesn't give you the right to break the rules. The rules apply all the time, there is no "they started it" exemption.
Instead, you should report the player and ignore them. Use the blacklist if you need to avoid reading what they say in the future. Don't engage with them at all. This way they get warned instead of you. Stooping to someone else's level is just as bad as the person who instigated it.
Also if you didn't report them, it's never too late. Open up the game and report them. See https://www.warlight.net/wiki/Report