I hesitate to reply to this kind of question from a noob, but here goes:
Firstly: ALWAYS PROTECT YOUR HAND. This is solely your responsibility. This will prevent accidental mucking. It will not, however, prevent ANY MUCKED CARD FROM TOUCHING YOUR HAND.
Secondly: There is no such rule in Robert's Rules of Poker. The TD is making his own rules, or he is an idiot. If he is making up his own rules, he should have them in writing. At the very least he damn well better follow them in a logical fashion. If you are making up a "no muck card may touch a live hand or it (the live hand) is dead" rule, then you should understand the implications and consequences of such an action. What is the penalty for the mucker? What is the penalty for the person who didn't protect their cards? How the f*ck can you take the chips from a call from a mucked hand? etc, etc.
From RRoP:
Under "Irregularities":
2.You must protect your own hand at all times. Your cards may be protected with your hands, a chip, or other object placed on top of them. If you fail to protect your hand, you will have no redress if it becomes fouled or the dealer accidentally kills it.
Under "Dead Hands":
2.Cards thrown into the muck may be ruled dead. However, a hand that is clearly identifiable may be retrieved at management’s discretion if doing so is in the best interest of the game. We will make an extra effort to rule a hand retrievable if it was folded as a result of false information given to the player.
and:
3.Cards thrown into another player’s hand are dead, whether they are faceup or facedown.
I would point out the TD's obvious deficiencies in the performance of his "job" and make him read Robert's Rules of Poker, or make him write down his own rules. Next time you are playing in a tourney with him, get a careful read. Whenever he looks super strong, muck your cards directly at his hand. If you hit them, he's out. Dodgeball Poker! Or... he will make up a rule that you can't throw your mucks into someone else's hand. :idea: