How did August react when his mother tried to make the play seem boring?

Auggie reacted by getting angry (hurt) and calling both his mother and sister liars.

“You’re lying,” I said. “Excuse me?” said Mom, kind of shocked. Even Via looked surprised. “I said you’re lying!” I shouted. “You’re lying!” I screamed at Via, getting up. “You’re both liars! You’re both lying to my face like I’m an idiot!” “Sit down, Auggie!” said Mom, grabbing my arm. I pulled my arm away and pointed at Via. “You think I don’t know what’s going on?” I yelled. “You just don’t want your brand-new fancy high school friends to know your brother’s a freak!”