I don't think that he is necessarily conditioned to see it. Seeing the difference between a BluRay movie and a DVD movie is very clear (at least to me). The BluRay movie has sharper edges, its motion is clearer and the image pops more.
Could it be simply the difference between the camera technology then and now? Maybe, but even between the same movie in BluRay vs DVD I have been able to tell the difference, my dad for instance put in the DVD instead of the BluRay disc by accident and I asked him if he used the BluRay disc or not about 2 or 3 minutes into the movie.