No. Most people can be hypnotized although some can take longer than others to relax and use hypnosis effectively. There here are a small group of people who may not respond to hypnosis due to their inability to perceive context and implication, which can be an aspect of Asperger’s syndrome.
Once you experience the state of hypnosis you will understand why this is the case. Hypnosis is simply an engaging and deepening of the brain’s natural ability to focus and imagine. And in this relaxed ‘altered’ state of mind, the critical conscious mind can be bypassed to access your subconscious mind. In doing so, suggestibility increases, such that the suggestions given are accepted as being true and effect beliefs, habits, perceptions and behaviours.