Drawbridge mentality is when people build virtual walls between themselves and other people or groups that they don't know or don't like. It's like having a drawbridge - if the drawbridge is up, it's hard for people to come in and out, and it can make it difficult for them to get close to you. When people have drawbridge mentality, they try to keep others out, which can make it hard for them to make friends or have meaningful relationships with others.