His point, as far as I can tell, is that in different countries legally define rape in different ways, but that shouldn't change what we find morally wrong.

To extend on what I think he is saying, he thinks it should be possible to say a thing was morally wrong regardless of which country it happened in.

If we're discussing if we think a person did something morally wrong, I'd rather talk about why we think that rather than pointing out there is a law against it (especially when the laws are different in different places).