Example: Old people often complain about young people not having "basic knowledge" and say that younger generations know and understand less of the world than they do.
They think the things they learned as a child are still relevant today.
Sometimes they're right, most of the time they're not.
Like, some people are still super upset that cursive isn't taught in school, mostly because humans don't like being the last in a line of knowledge, because that means they didn't really need it.
For an extreme example, look at the pushback again cochlear implants from deaf communities, especially from people over 40. A significant amount want to prevent deaf children from being able to hear, just because it makes the deaf community smaller.
Even if people don't admit it, we all want our "tribe" to expand. And tribal lines are only racial lines when racial segregation is happening. Segregate all the dead kids into a "school for the deaf" and they're gonna get tribal and want to see that tribe continue to exist even if that means their tribe members are worse off personally.
It's basic human psychology, to tie it back up to your question.
Getting mad at later generations for not learning the same stuff, is just a small slice of that behavior.