^^ what he said, I don't think anyone resigns if it's a drop trick, it goes to that 'player not responding' screen.
If the dude actually resigned, the game said you won, and you still lose points & it's recorded as a loss then I'm pretty sure it's the resign hack, not the drop trick.
I've only been resign hacked once so far, and if I ever get matched up with that dude again I'll just alt-f4 outta the game. It's about all you can do...