As your friendly neighborhood scientist, I would like to remind everyone that this is not the proper way to do this type of survey. There could be selective reporting, or a racial bias in who even visits these boards in the first place. These things could skew the results to appearing as though one race or hair color were associated when it is not. A better, though not perfect way of going about this would be to pool both NTs and ASDs on their hair color, then statistically compare the results between the two. This still has the problem of selective reporting though.
Probably the best way to get at this is to visit google scholar and comb though the much more rigorous peer-reviewed studies performed to date on this topic. I'll link to some here.
This study suggests that children of non-white immigrant families in LA were actually more likely yo exhibit more AS symptoms, and had more dramatic symptoms, than white American families. However, to what degree more dramatic symptoms may manifest from increased childhood stress in individuals that grow up with disproportionately higher discrimination and lower income remains unclear:
https://pediatrics.aappublications.org/content/134/1/e63.short
This study suggests that boys of the African diaspora were statistically less likely to be diagnosed with autism by age 8, but the difference is less than 2%
https://doi.org/10.15585/mmwr.ss6503a1
...and that could have an alternate explanation because non-white autistic children tend to get diagnosed at an older age in the USA https://doi.org/10.1097/00004583-200212000-00016
I think you'll find this a complicated but interesting topic to research. Really, it is better to read up on multiple studies than to base your assumptions about race and ASD on this predominantly white forum.