Ultimately, the debate about evolution depends on the age of the earth, and collagen in Dino fossils is not much of an argument either way at this point in our knowledge. I think if presented that as evidence, I would say it is irrelevant, though not inconsistent with an old earth, but the real evidence comes from multiple independent disciplines that confirm one another, including physics with dating techniques, astrophysics with measurement of distances in light years, geology, plate tectonics and so forth.
Those obviously have had responses from fro the YEC community, but might crack open the door to discuss different interpretations of the Bible, that are independent of scientific interpretation. You can discuss problems with the literal plain reading approach, such as days before the sun appeared, the idea of a firmament the mistaken cosmology of the plain reading, and perhaps guide the discussion over to something actually useful, such as what message you think God was trying to convey and how that affects how you live your life and relate to him.
Intimately, it may be futile as suggested, but at least planting the seed that you don’t have to reject God if you come to reject the YEC interpretation may someday be meaningful for that individual.