I was on his server very recently as well. He had an airport that made it fairly difficult to fly. I gave him some suggestions and he immediately got all pissy and got insulted even though he stated many times that he did not build the map. After a while he started wanding things and saying something along the lines of "You're the expert ass hat mother forgeter who cares and thinks he's the boss of my server, YOU fix it."
Thus, he attempted to enslave me and harass me while I "worked" for him. This wasn't worth my time, and, after he banned me (I'll post a pic in a minute), I decided that I would rather not go back there again... Total badmin.