A wise man never argues with a fool - he knows there's no sense in it.
Arguing with a 2-year old accomplishes nothing - it takes two fools to have an argument.
It always takes two fools to argue - two wise men will not argue. One wise man will not argue with a fool, therefore it takes two fools to argue. Ask yourself, "How important is it to take a stand on this issue?" Will it leave a lasting effect on my life? If not, perhaps it would be best not to continue the stand in this situation. Remember, you may not win on an issue, but you will save your serenity and dignity, and you will not be damaging the relationship.