He sounds delighted by this fact. Not fishing for compliments, just - genuinely happy that Annie has nice things to say about him.
"Are you likely to be visiting her here at all? Should I be taking note of your food preferences?"
"I try. If all else fails and it turns out to be unfavorably comparable to charcoal, I can always just cook something for myself later."
"Certainly more convenient than the alte- Annie! Did you hear what I shouted?"
"Yeah, can't see invisible people, I'm informed," Annie confirms.
"You were okay in the interval?" She appears to have claimed the phone from her mother.
"You're welcome - oh, um. If my mother hadn't been home when you'd called would it have been a disaster?"
And then wait for her to call back while he was writhing in guilt because he didn't get up and try to find her house and tell her himself. Details.
"Maybe in the future you should call me before you learn things? And make sure I'll be around to hear them after you have learned them."
"I'm not the one who would've suffered for it. Please don't hurt yourself."