I've just recently fired up my own dedicated server, and I get this person, who at first, is only slightly annoying, mostly blasting the hell out of everyone with this tank another player had spawned. So, I dropped a polite, "Please stop," and they complied.
They began building and would yell at anyone who came near them while they were building, including me, and chase them down with the hammer, to which I responded by sending them to jail repeatedly. After that, it all went down hill, and ended with:
"I could be a better admin than you."
Me: "Really?"
* has been kicked by Sorcerer311.
I felt mildly bad, as they were a talented builder, but I don't take kindly to people creating trouble for no reason.