I'm sorry, if I'm running the main scenario DF or another dungeon that is well below my ilvl in terms of difficulty, there really shouldn't be an issue SBing. I completely agree that SBing an entire set in a dungeon is rude, but SBing a couple of accessories abd/or even a general armor piece is fine as long they make it up with the rest of their equipment. I wouldn't spiritbond a weapon though.