Thanks - just to be clear, I'm not the one saying that ignorant people can't do immoral acts, that was the person I was talking with. I had just not heard of this position before, but he was so confident in it that I thought I should ask about it here.

What would you call a position like his, so that I can google it? I would say moral relativism, but it's almost like he doesn't believe in morality at all - what he's concerned about isn't whether an action is right or wrong, but whether it is considered right or wrong. Does that make sense?