There can be many reasons for this. It could be due to a lack of understanding or knowledge about the topic. It could also be because the person is not actively engaged or interested in the discussion. Additionally, it could be due to distractions or a lack of focus on the conversation. Some people may also struggle to express their thoughts and opinions effectively, leading to a perception of mediocrity in their responses. Ultimately, everyone has different levels of intelligence and ability to contribute to a conversation, so it's important to approach discussions with empathy and understanding.