I'm sure that many would be really uncomfortable with what you are saying, as this argument boils down to the position that there is no right or wrong, there is only socially acceptable or unacceptable. It is an interesting position to take - certainly worthy of intellectual debate - but you state it as if it were incontrovertible fact, which I don't think is justified.
If I say something that directly offends a person, I will apologize. However, I feel it is unintellectual to curb my opinions on the possibility that someone might interpret what I say as something insulting, especially since I have no intention to insult anyone.
Just to clarify, I was not offended by your opinion, nor I am asking that you curb it. I am, however, suggesting that you have presented opinion as fact in this case, and that the opinion is one which would make some people uncomfortable - consider, for example, those who hold strong religious beliefs, and who believe in right and wrong, not just socially acceptable and unacceptable.
My point is simpler than how you're interpreting it I think. Consider this. If you were born and lived as a hermit, completely separate from any form of human society, would you have any concept of child, adult, man, woman, sex? My feeling is no, we would not. Therefore, you would also have no concept of murder, rape, homosexuality, race, marriage, religion, etc. And if you don't know what these things are, then you can't establish any of those things as "wrong." It is when you meet a woman or when a person teaches about women that you realize what a woman is.
When I say we are born without morals, I say this because morals govern the way we deal with other people. Therefore, it seems to me that morals must be socially based and not inborn.
Let's extend your hermit analogy. Our theoretical hermit lives completely separate from any contact with other humans, but does have contact with other animals. He (let's assume our hermit is male) does still have material needs (food, shelter, etc.) and certainly can feel pleasure and pain. He hunts for food. For entertainment, he catches and inflicts pain on small animals, because he finds that he enjoys it, killing them when they cease to provide amusement.
Is what the hermit is doing not wrong because he has no social influences to teach him about right or wrong?
Now, I am not trying to argue that many of our views on right and wrong are not both socially influenced and constructed - clearly, they are, as evidence that different societies have developed different views on some issues - but is there no room for something to be wrong as a matter of principle?

