Beth rolls her eyes. He's trying to wind her up, whether he believes what he's saying or not. So, her words quiet, she answers, "I almost killed your entire planet. I don't need to be more of a bastard today."

Just by being here, she's taking from them. Maybe eventually, she can steal more than her share, but it doesn't seem worth it right now. Especially not if it leads to eating more horseflesh.