Just realized something about angel that the show ignores despite the irony

When angel is jealous of Xander at the beginning of season 2 Buffy says "why are you jealous?"

Angel immediately without hesitation says "of Xander? He's just a kid" all while staring at buffy like he didn't just call her a kid too

Then the argument moves on but they never even addressed that ironic statement. Buffy is a kid too angel. Had me raise my eyebrows on this recent viewing.