Surely if man and dinsosaur co-existed, this would not be a hard challenge.
Clearly you have no concept of how little of a human remains after being cycled through a dinosaur...
So, every human that lived in the time of the dinosaurs was eaten, so that's why we find no contemporary fossils.
Do you have the slightest clue how utterly ridiculous that position is? Apparently not.
It's very hard to argue with people who don't use their minds.