Most people born in the nineties and before definitely struggle with computers - maybe not the academics in your circle, but anyone not exposed to or interested in technology.

I spent a while working in tech support for small to medium businesses, and boy, did those people have trouble to understand the basic interaction with their computers. Instead of learning the paradigms and applying them to general situations, they would memorise where on the screen to click, in which order.

You’re uncharitable view of generation Z is pretty much proven wrong if that is your assumption on what you can do on Instagram, though. Looks like a classic „my generation was the last good one, everyone else born after is stupid and lazy!“