Can objective morality exist in Atheism?

[objectivitees]

The source of morality, whether religious or not, has always come from the same place - societal norms. There was morality before religion, just as there will be afterwards.

We wouldn't get very far as a species if we went around killing everyone and taking all of their stuff.

It goes on the principle of the golden rule, which rings true in animals as well: Treat other the way you would like to be treated. Conversely, don't do anything that you wouldn't want done to you.

Pretty simple actually.

There is no such such thing as a objective moral standard.(Emphasis added)

So, your answer to my question is "no"? If that's the case, is the "golden rule" objective?