The delightful paradox being that their claims about Mary being sinless turn Mary into a liar... and therefore sinful.
Well, what none have been able to answer is that what God allegedly did for Mary, in having her be born sinless of a sinful mother, why couldn’t He do it for His Son?
If Mary could have remained sinless being born of a sinful mother, then Jesus likewise could have been born of a sinful mother and remained sinless.
The indoctrination runs deep to have that kind of logical dissonance.