What you did was delaying and valour farming (intentional or not, admins can't read your mind),justifies a kick at least. You only got a warning, which instead of taking seriously you've decided to respond to with a "joke".
Now let me clear something up. I (personally) don't mind/care if somebody makes a joke about me ingame or even insults me (to some extent), as long as it doesn't have anything to do with me actually trying to enforce the server rules. It's only funny for you, besides how do you expect people to take admin warnings seriously if everyone starts responding to them with jokes like yours ? Please try to understand this position.
Unfortunately for you , Meow beat me to it and banned you first for a day. My ban was going to be a bit shorter.