You are literally arguing against your position.

You ask "Are there things everybody KNOWS are wrong? "

You are presupposing that these things ARE in fact wrong, and that is the question. What makes these things wrong as an atheist? On what basis? And is it in fact TRUE that these things are wrong? Or is it just an opinion?

And nobody argues that the Bible is the objective standard, we would say God is the objective standard of good but that's beside the point for now. We can go into that after you establish the atheistic ground for establishing right and wrong.