In this case it really sounds like the person was over reacting.. (mind telling us where this was???)
As Jack says, no one puts out 600 feet of rode, and if this guy was anchored in the depths you suggest his circle is going to be quite small (assuming he actually stays there.....)
IMO it was unreasonable of him to chastise you...
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"