No, humans and dinosaurs did not coexist on planet Earth. Dinosaurs lived during the Mesozoic Era, which began approximately 252 million years ago and ended about 66 million years ago. They went extinct at the end of the Cretaceous Period, around 66 million years ago, due to a catastrophic event, likely an asteroid impact.
On the other hand, modern humans (Homo sapiens) have been around for a relatively short period of time. According to current scientific understanding, the earliest known evidence of Homo sapiens dates back to around 300,000 years ago in Africa. However, anatomically modern humans, similar to the ones we see today, appeared around 200,000 years ago.
Since the extinction of dinosaurs happened millions of years before the appearance of modern humans, there was no overlap in time, and they never coexisted on Earth. The idea of humans living alongside dinosaurs is primarily a concept popularized by fiction, such as in movies, books, and cartoons.
It's important to rely on scientific evidence and research to understand the history of life on Earth, and according to our current knowledge, humans and dinosaurs lived in vastly different eras separated by tens of millions of years.