It's not a valid inference. But it's not that's not the same thing as contradicting a rule. Finally, some answers will be too weak to contradict, which is sort of like saying unopposed that they could still fit within the margins of the facts we were told. If I'm told that most clowns are scary and an answer says some clowns are really nice and welcoming, that doesn't contradict. It's too weak. There's room for some clowns to be nice when I've only said most clowns are scary.