What IS good, and how do we determine it?

[Longhorn]

That we can have different moral standards and values

We can have different morals and values. Most people do! It just doesn't mean we can both be right. She thinks she's right, I think I'm right. I would never kick someone to the curb for believing differently from me.

But how can that mean there are objective moral values? And how do you know you're right?

Bsides like Rob said, if it comes from god it's subjective