Again, people are conflating two things:
- their perception of Meghan's skin
and
- her experience of being mixed race
Meghan Markle grew up in America, which is a much more racist country than the UK, with a black mother and darker skin that some people and I'm sure she suffered from discrimination.
But, yes, her skin isn't actually very dark, and just to look at her you wouldn't necessarily guess she is mixed race.
These two things aren't contradictory if you really think about it.