Actually, it's John channeling the Alan Alda who talks too damned much when he should emulate the decent guy behind the ranting.
Panel 1: We start off with Designated Villain Ted needling him about how he's doing as a Mister Mom. John tells him to man up and step off.
Panel 2: Instead of taking the hint, Ted says that he was just fooling; he then asks how life is without the "little woman." John says "just fine, thanks."
Panel 3: He then tries to purchase Ted's silence by bludgeoning him over the head with a wall of text about how it's perfectly natural for men to assume nurturing roles and how more and more men are doing it and so on and so forth.
Panel 4: Ted reminds him that he sees this all the time in his family practice.
Panel 5: He then leads out with a not-so-funny non-sequitur about how if you don't practice on your family, you can't very well practice on anyone else.
Summary: It might actually be that Lynn is trying to depict the children as being scarily dependent on Elly; if so, that's a subversion of her original premise.