It triggers a visceral rage in these older people at what they perceive as disrespect and of course at what they perceive as the loss of their white supremacist culture. They think they (the white boomers) were the best generation and culture that ever existed, any deviation is a horrendous descent into childish barbarism that must be corrected. All must eternally bask in and uphold the glory of their culture.

It's paternalistic mainly, it's also racist, it's lead-brained knee-jerk anger response. It's very deeply rooted in Christian paternalism "respect your elders, honor thy mother and father (with obedience)".