In any other context, such as hair colour or height, speculating as to whether a child's appearance is likely to favour his mother or his father in looks would be seen as perfectly reasonable and inoffensive.

How far speculation about skin colour should be taken as different enough to be necessarily or intentionally offensive is unclear. There could be room for misunderstanding.

Pretty evidently Meghan misunderstood the position as regards royal titles, if she thought Harrys's children had an automatic right to be princes or princesses, and that Archie was being discriminated against. I'd have thought Harry might have pointed out that out. After all his cousins, the children of Anne and Edward, aren't princes or princesses.