They have an attitude that either they have a math mind or they don't. There is nothing they can do to become better in math. They sit back and don't take action. They don't trust their intuition. They rely on memorizing rules instead of understanding the concepts.
Many people dislike or feel anxious about math.
Once you recognize that you have math anxiety you can start to correct it. Become aware of where your math anxiety originated from. Think back to where you first had difficulty with math. Recognize your self-defeating talk and correct it to a more positive talk. Trust your instincts and don't put down your approaches to a math problem.