Well, you're making assumptions and projecting your values onto their work. You are assuming their intentions and deciding that this necessarily makes their work less valuable.
It is okay that you don't find value in it, but you cannot say that there is no meaning at all. You also cannot assume the artists intention to "cheat".
Some art is the pure expression of thought. Thought can be extremely abstract. Experience can even be very abstract. There are so many transient concepts in the world that cannot be explained by reason because there is also the constant presence of paradox. So the meaning of a painting cannot be "reasoned" out. As a psychologist, I appreciate abstract expression. It gives me ways to interpret a person, but I have to do some legwork. It's like in therapy. A patient never simply tells you what is wrong. They don't know what is wrong. If they did, they wouldn't need you.
So, again, it's okay not to like it but please do not make a general assumption that their form of expression has no value or meaning because you don't care for it.