Speaker A insults speaker B, so speaker B insults A:
A: "I'd no more leave her in your care than I would my own soul."
<A thinks B is an incompetent care-giver; A wouldn't trust B to care for anyone or anything, including A's soul>
B: "Hmmmmph, I've never been persuaded you had much of a soul."
<B insults A by implying that A lacks character/heart; i.e., 'you [don't have] much of a soul'.>
B: "More like a little damp anchovy stuck between your breasts, trying to breathe. That's what you smell like, anyway."
< B describes A's heart/soul as a saltwater dwelling small plankton-feeding fish that smells rather bad.>