You don't need to have a rule book of your own (or access to one online) to make another player provide the rule under which he's trying to restrict/penalize you. Especially if they're a PDGA member since they should have a rule book of their own.
If they're going to call a semi-obscure rule (which I'd define as anything that a casual tournament player like yourself might not be aware of), it's on them to provide the proof that the rule exists as they understand it. If they can't, you shouldn't let them try to pull one over on you.
Were I the player you tried that on, I'd go ahead and make my putt anyway. Then let the TD decide whether or not to penalize me the two throws an illegal disc would cost me. If it's deemed legal, I'd could ask the TD to DQ you for unsportsmanlike actions. Doubt the DQ would come, but hey, one good turn deserves another, right?