That's fine, everybody's entitled to their own opinions and aesthetics, because, as I said in the post that spawned that discussion, art is completely and utterly subjective. As long as you don't say some hogwash like "that's not art because it isn't pretty/doesn't look real", "that artist has no talent/any old person can do that/what a waste of paint supplies", I have no problem with it.
That being said, and as a person who up until relatively recently was totally baffled by modern art and its appeal, I would encourage you (and anybody, for that matter) if you have the time/free units, to take a History of Modern Art Course. Of all the classes at Uni (and this is embarrassing to say as a prospective History Grad Student), no one class so totally changed my personal beliefs and how I looked at something as that modern art class I took.