Since when can't you state your opinion..

[Ivan Tempski]

You could've just removed the comment and moved on with your life.
He called you a bad mod, not an <insert cruel disrespectful word here>.

If a client IRL thinks you're doing a bad job, and you react like this back, you will end up in sh*t. 
Just smile, nod, ignore, move on.

For the last time, I did NOT warn him for that. And it is none of your business to know what I warned him for.

None of you actually seem to know what I said in the thread, If you look back to around the start or the second page. I clearly stated he was NOT warned for calling me a bad moderator. As you guys suggested, I removed it and CARRIED ON.