What is it exactly that you're finding hard to believe?
The fact that Wakandan's are being written as being exceptionally discriminatory manner towards Nezhno?
Or that said discriminatory action on the part of Wakandan's was written in the well established manner and tone set by X-writers?
What is it you find hard to believe again?
The fact remains that as I stated previously, in the absence of a solo Black Panther book wherein a wide range of topics can be adequately explored, all Wakandan related appearances and references not written by
Jonathan Hickman will more or less be uncomplimentary and disparaging towards T'Challa, Shuri and Wakanda.
And based on what's been establised in canon, T'Challa is in no position to be changing any rules in Wakanda as he's not ruling that nation at present.
She is....
Her name is
Shuri.
You might have heard of her.