{ 1 } - The basic moral rules ought to be the same everywhere, but derived moral rules can vary.
{ 2 } - Yes, he was a cultural relativist, holding that what is good is what is socially approved.
{ 3 } - No, he thought that there could be no significant variation between cultures.

The basic norms (like the golden rule and the wrongness of stealing) are objective, fixed and unchangeable, and based on nature instead of convention. While our minds can be perverted by passion or vice, we cannot be completely blind to these basic norms. On the other hand, these basic norms can be applied differently to different cultural situations. So, while stealing is wrong, ownership is sometimes vague and can be specified differently by different cultures.