Some years in, ten or more, he began asking her to prove things, in casual conversations. She’d say I read this article that said such and such, and he’d say That’s not true. Where did you read that, show it to me, and she’d say I don’t like when you talk to me like that. He usually indicated frustration when she pointed this out, tried to dial back talking to her like that, but the conversation usually wrapped up after this.