Hermione should have known that Ron would see, and Harry for that matter, and she was just about to cut Ron off and tell him that she didn't want to talk about it when what Harry had said cut through her own thoughts.
For once, she almost agreed that Ron should punch him.
"Harry!" She couldn't keep the hurt out of her voice, and it mixed with her complete indignation. "Don't be stupid! Of course we're helping!"