There’s actually an in book way to explain that, the clothing is always described as specific to the two rivers, and only Aiel have red hair. I agree The show was awful!
Bigger issues as other people pointed out are things like inventing weird bullshit storylines when you have 10k pages of content to draw from, or messing with the “hard rules” of the magic system, such as you can’t burn out in a circle, or heal someone from death.
But the village looked like like an HR training video. To contrast, a new season of squid game just came out. Everyone is Korean. Everyone speaks Korean. Everyone looks Korean.
This makes the show feel more real.
Or maybe you are hyper focused on specific, racial, details that you care about due to some internal biases?