Why are people like this?

The Father of a graduate pushes the superintendent out of the way because he doesn't want his daughter to shake the hand of a black man.

https://www.channel3000.com/news/lo...cle_a34787ec-2283-11ef-8b5d-a7b61f771588.html
Same school

https://www.theguardian.com/us-news...cture-baraboo-wisconsin-divided-american-town
Same school

https://wiscnews.com/news/local/edu...cle_c0051bd4-e342-5434-9ba4-3053401a0310.html