If someone from the 1950s suddenly appeared, what would be the most difficult thing to explain about life today?

how old were they in the 50s and how old are they now? That's probably the crucial thing to know. 70 year old was born in the 1880s and probably would have difficult time to understand much of the current society. 15 year old would probably learn quickly new technology and societal norms. If they'd be middle aged or a bit older man, they'd probably be quite uneducated and would probably have difficult time socially to adapt modern society, where you can't casually sexually harass women and where you don't get job simply by walking to work place without a college degree.