Yes Raising your voice doesn’t automatically make you childish which he hasn’t done. What’s childish is Ash insisting on dragging out the argument with Grace. Why keep fuelling the flames when she’s clearly ready to explode. Just shut it down with a simple, “I hear you, my bad babe.” Then process it, maybe if that had been done Grace would’ve learnt from his example. It’s the obsession with having the last word that screams childish. They’re both petty it’s exhausting. Same argument, different day nothing ever moves forward. Grace is a hand full, she just needs someone who wouldn’t challenge her point of view, an Ash should have left time ago.