What, that it's wrong to hurt people? I've never (seriously) disputed that, though. I don't run around pushing over old ladies and looking for puppies to kick, you know ;)
The only thing I take issue with is the foundation of that statement, where the notion of the wrongness of it comes from in the first place. I can't disprove that morality is a universal truth, or that God is somehow responsible for the nature of what we call morality. All I can try to do is show that neither one is necessary, that alternate, perhaps more parsimonious, explanations exist.
And my dispute would be that if these alternate explanations rely exclusively on objective and pragmatic criteria (survival of the species, functionality of society, etc.), then they're seriously lacking.