1. Su Mingming is timid. He will scream when watching horror movies, which may also cause him to be afraid of lizards.
2. Charlie Sue may have had an unpleasant experience with lizards, which may form a bad impression and lead him to be afraid of lizards.
3. Charlie Sue may feel that the appearance or behavior of lizards makes him feel uneasy or uncomfortable, which may cause his fear reaction.
In a word, everyone is afraid of something for different reasons, and the above explanation is just one of the possible reasons.