My daughter is lactose intolerant and I’m pretty sure she is Caucasian.
From Wiki...
The frequency of lactose intolerance ranges from 5% in Northern European to more than 90% in some African and Asian countries.[7] Some have argued that this links intolerance to natural selection favoring lactase-persistent individuals, but it is also consistent with a physiological response to decrease lactase production when it is not needed in cultures in which dairy products are not an available food source.[8]