Cinema presents a curious case. It might be the only art form suposedly enjoyed by the majority that is divided into two, and often, three, epochs.
'Old' (black and white) movies, versus 'new' (color) ones. And silent versus talkies.

The silent era, then black and white talkies, then colorized films. These are the three general epochs, and the vast majority of people generally only like the latter.

There really is no such thing as 'old' movies- there are only good, or bad, films.

It's as if someone said "I don't like old paintings, i only like the ones that were made recently." Philistines.

I think one of the reasons people don't like older films is an inability to relate- they cannot view the film within the context within which it was made- i.e., people are ignorant and unimaginative.