"With just a few words. And then a few more. And then the words turned into insults and threats and worse, and then a man was dead. Just because of words."
Royal was silent, chewing on all I'd said, I imagined.
"I know you told me words are just words, Royal, but words are powerful things—"
I felt a poke in my back. "Hey, Mattie..."
I turned around. "What, Jim? What do you want?" I asked, irritated.
"There goes Seymour! Ain't you going to wave?"
"Seymour, Mattie! Seymour Butts!"
Jim and Will howled with laughter. Royal didn't actually laugh, but he grinned. And I was silent the rest of the way home. (14.monochromatic.97-105)
Right after Weaver gets into the conflict with the man at the train station, Royal gives Mattie a ride home. Whereas Mattie is contemplating the power of words and the meaning of them, Royal and his siblings demonstrate, somewhat insensitively, that words don't necessarily have to be important. In fact, they clearly communicate to Mattie that her words and ideas aren't important because they don't listen to her. So Mattie chooses to be silent.