Some people don't like giving their opinion because they fear being judged. They worry that others might criticize or make fun of them. They also don't want to offend anyone or be misunderstood. This fear can make them anxious about speaking up, so they prefer to stay quiet to avoid any conflict or confrontation.

Some people don't give their opinions because they lack confidence. They might feel they don't know enough about a topic or that their opinions aren't valuable. They might also have had bad experiences in the past when they shared their thoughts. This makes them feel overshadowed by more dominant personalities, so they stay quiet.

Cultural or social norms can also play a role. Some people are raised in environments where giving opinions is not encouraged. In some cultures, harmony is valued over individual expression, so people prefer to listen rather than speak. They might also believe that actions speak louder than words, so they don't feel the need to voice their opinions.