Yeah, we were on port and he was deliberately screwing me up while I was placing exploit blocks.  I warned him many times, and even kicked him once.  Then he came back, swore at me several times, and left.  He later then came back and continued to do it.  I was tempted to ban him there for a day, and almost did, but then the server crashed.   For some reason whenever I am about to ban someone, the server crashes. And I see Error has already banned him.