I do. From a biological perspective, having scales and laying eggs and having "boobies" is much less of a verisimilitude breaking thing than sprouting an extra pair of limbs or breathing fire. Therefore, to me, dragons are obviously not reptiles. And as a consequence, dragonborn having boobies isn't necessarily all that weird.
We could say:
Neither dragonborn nor dragons are "reptiles" in the standard biological sense.
Both dragonborn and dragons are "reptilian", meaning that they have characteristics similar to reptiles.