with you guy have question about hair dye, go read seirei gensouki you may know, maybe in the oldtime hair dye is something human never think about, it not like present, with us/ modern people hair dye is just something normal
if you wanna know more why ppl dont thinking about hair dye in the past then ask yer ancestor or some old ppl, they will 70% say they hate modern people that dye thier hair
and about who ask why ppl dont thinking like him and thier parent ? ever ask why ppl racism other ?