I was marking someone, and was at about stall 6. They switched between their forehand and backhand grip, bringing the disc bwteen us. My hand insitinctively came up and it briefly (and lightly) grazed the disc onthe way by. Buddy called a foul. I said it wasn't a foul because it didn't affect the play.
Just looking for some opinions.
I think by XVI.H.3.a.1:A throwing foul may be called when there is non-incidental contact between the thrower and marker. The disc in a thrower’s possession is considered part of the thrower.
and II.H: Incidental contact: Contact between opposing players that does not affect continued play.
I'm correct.


Gray area
You can also make the argument that you were inside his disc space, therefore any contact is a foul on you.
If you grazed the disc as little as you say, it shouldn't have been called anyway. Bad call indeed. I don't see how it works in his favour to call that unless you were at stall 9.
Since 'disc space' is
Since 'disc space' is defined by the thrower's pivot foot and not the physical location of the disc, this situation is not necessarily a disc space violation. That being said, one of your moving extremities (rather than torso) contacted the disc (which, according to the rules, is consistent with contacting the hand) so contact has occured.
Whether the contact was incidental or not can really only be decided by the thrower in this case. Perhaps the slight graze altered his grip sufficiently to deter a throw? Or was enough to mentally alter his intended plan?
At the end of the day, I would say that it is an allowable but unadvantageous call. As Andy pointed out, aside from the notion of a stall 9 count lowering, throwers calling fouls like this tend to disrupt their own team's flow and often reduce available cutters since play comes back in with receivers being static rather than dynamic. This game would be awful boring if a call was made every time there was 'mild' contact on the field.