What is this silliness?
Just that, Faith, silliness.
Some dinosaurs survived on the ark, but didn't do well in the new climate after the Flood, although as someone pointed out some of them survived long enough to give rise to all the dragon stories. None of them "survived into the modern age."
Then your argument is with DavidJay. Here is what he said
DavidJay writes:
and Yes a few dinosaur like leviathon animals or dinosaurs or Lochness monsters did survive in the waters of the flood.
Not "on the ark", but "in the waters of the flood."
So I take it you agree that that statement is silly and deserving of mockery. Good.
HBD
Whoever calls me ignorant shares my own opinion. Sorrowfully and tacitly I recognize my ignorance, when I consider how much I lack of what my mind in its craving for knowledge is sighing for... I console myself with the consideration that this belongs to our common nature. - Francesco Petrarca
"Nothing is easier than to persuade people who want to be persuaded and already believe." - another Petrarca gem.
Ignorance is a most formidable opponent rivaled only by arrogance; but when the two join forces, one is all but invincible.