I think this thread has a gender bias first of all. Are blonde males also "dumb." Secondly, what does the color of a person's hair have to do with natural intelligence? The connection is very weak at best. What about people who are bald, or who have cut off all their hair?
I'll try to look for the link that I found on Facebook. And I honestly have no idea. https://consumer.healthday.com/public-health-information-30/social-network-health-news-779/eraser-challenge-latest-harmful-social-media-trend-for-kids-720895.html