Have you read the letters? I have.
I dare say you’d want your wife receiving such.
dragging a few letters out of a 60-0dd year relationship into the conversation under the rubric of their being "flirtatious" in order to somehow defend TJ from the (probably) true charge that he was impregnating his slaves is intentionally misleading.
I would say it is fundamentally dishonest, but I don't know the guy that said it, and that's a pretty heavy charge.