Just imagine this interaction from the mom's perspective. (Because the author sure hasn't!)

You're minding your own business just doing laundry or whatever and your adult son just shows up to you house totally unannounced with a foreign stranger in tow looking for you to cook them a meal. Come on, that is really rude!

Like, it's clear this guy thinks the mom is a total NPC in this situation. It takes some serious delusions of grandeur to think the mom is "happy" about this interaction.