[QUOTE=Shalmanese]
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Bone fragments. Animals which lived in the same era as humans have recognisable markings on their bones from spears, human teeth markings and charring from fires. Dinosaurs have none of that.
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We have no evidence of them living together. None at all.
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There is such evidence- Look here:
Rapid Extinction of the Moas (Aves: Dinornithiformes): Model, Test, and Implications
R. N. Holdaway, 1 C. Jacomb 2
A Leslie matrix population model supported by carbon-14 dating of early occupation layers lacking moa remains suggests that human hunting and habitat destruction drove the 11 species of moa to extinction less than 100 years after Polynesian settlement of New Zealand. The rapid extinction contrasts with models that envisage several centuries of exploitation. *
http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=ENV&recid=687874&q=moa+hunting+evidence&uid=786768182&setcookie=yes
Habitat preferences of moa in central Otago, A.D. 1000-1500, according to palaeobotanical and archaeological evidence.
Anderson, AJ
Journal of the Royal Society of New Zealand [J. R. SOC. N.Z.]. Vol. 12, no. 3, pp. 321-336. 1982.
*The habitat preferences of moa have to be inferred from indirect sources of information. Palaeobotanical data (historical records, fossil logs, charcoal, pollen and soil and precipitation patterns) are sused to infer the probable distribution of forest and shrublands in central Otago between approximately A.D. 1000-1500. The results are compared with the locational characteristics of contemporaneous moa hunting sites in the same region. Given the assumption that the hunting sites were located in areas where moa population densities were highest, it is concluded that preferred moa habitats lay in shady situations along watercourses, mainly in the lower hill country and gorges of eastern central Otago, where dense, mixed shrub association were the predominant vegetation type.
*
Here (pdf)
And then here is some evidence that man hunter the “elephant bird” “Aepyornis”
http://www.africa.kyoto-u.ac.jp/kiroku/asm_normal/abstracts/pdf/19-3/127-148.pdf
Here is evidence that Man hunted dinosaurs in the Lower and Middle Pleistocene :
http://links.jstor.org/sici?sici=0043-8243(197102)2%3A3<278%3ATDOEMA>2.0.CO%3B2-R
No doubt, early man hunted and thus lived with dinosaurs. True-all of the evidence only points to dinosaurs of the class Aves (birds), and not everyone agrees that Aves are Dinosaurs- but that’s currently the consensus.
But what is a dinosaur to our OP? Just Ornithischia (bird-hipped) and Saurischia (lizard-hipped) dinos? (Tyrannosaur and Triceratops for example)? Or does he include other prehistoric reptiles, such as the pelycosaur Dimetrodon, the winged pterosaurs and the aquatic ichthyosaurs, plesiosaurs and mosasaurs?
Ok, then- here it is pretty much- other than Birds (if we assume them as a form of dinos): the Cretaceous-Tertiary extinction event, which occurred about65 million years ago at the end of the Cretaceous period, caused the extinction of all dinosaurs, including other prehistoric reptiles, such as the pelycosaur Dimetrodon, the winged pterosaurs and the aquatic ichthyosaurs, plesiosaurs and mosasaurs. All gone.
Well, maybe. There is some small evidence that a few dinos did survive. Discounting stories of Nessie and the Sea serpent, we have:
http://www.gsajournals.org/perlserv/?request=get-abstract&doi=10.1130%2F0-8137-2356-6(2002)356<307:DTDNEF>2.0.CO%3B2
“Dinosaurs that did not die: Evidence for Paleocene dinosaurs in the Ojo Alamo Sandstone, San Juan Basin, New Mexico”
Note that only gives the possibilty that not every “non-avian dinosaur” completely died off exactly at 65 Million years ago- perhaps a few lingered on for a few million years. Sure, why not?
However, since the first Homo sp showed up around 2 million years ago, that leaves us a gap of 60 million years in which there is no fossil evidence of any non-avian donos at all. None. But sure, a couple could have lingered on, like the Wrangel is Mammoth which “lingered on” for some 10000 years after their last mainland cousin died off. I am very dubious- 10,000 years I can see, a couple million, I can see- but 60 Million?!? :dubious:
It is thus not completely impossible that one of our very early ancestors could have come upon one of the last few “real” dinosaurs. But that’s highly doubful. :dubious:
So, if by “dinosaurs lived at the same time as men”, your friend meant Avian dinosaurs, then sure ya, yabetcha, you can still see them now. I had one for lunch yesterday, fried. 
If by “dinosaurs lived at the same time as men” he means some tiny lost remnant population, like the fabled Mokèlé-mbèmbé
Mokele-mbembe - Wikipedia - then he’s not crazy, just credulous. And that’s OK. We certainly don’t know everything, and if we can find coelacanths and megamouths, who knows what might be out there?
But if he means man lived with everyday classic dinos, like on the Flintstones or “1,000,000 BC” then he’s a loon.
