Social Distancing
For some people, history is just one blob of a concept, and everything must have happened at the same time. That seems to be the thought behind this post. Apparently, the poster is not giving any thought to the fact that both cavemen and dinosaurs lived in completely different time periods.
It is true that children that grew up watching the Flintstones were and still are utterly confused by this piece of information. But you know, that cartoon was not a means to teach you about the history and evolution of life on earth.