[annalex]

she must have, first, married under a false premise

Not if St.Joseph knew that she desired to remain celibate and went along with it, not innatural if he, as the Church believes, was significantly older.

Also, calling someone a sinner without evidence is slander. Where's Mary's sin in the scripture?

[count-your-change]

“Also, calling someone a sinner without evidence is slander. Where’s Mary’s sin in the scripture?”

The apostle who took Mary in, John, would know something about who was sinless and was not. (1 John 1:7-10)