The statement that "your cat is dumb" is an opinion, and opinions can be subjective.
Cats are intelligent animals, but they show their intelligence in different ways than humans. They have excellent problem-solving skills, can learn tricks, and are very good at understanding their environments.
If you're wondering about your cat's behavior, it's best to consult with a veterinarian or an animal behaviorist. They can help you understand your cat's needs and how to best care for them.