Drawbridge mentality
A drawbridge mentality is the attitude of people who have migrated to a more exclusive or more "unspoilt" community and then campaign to preserve the tranquility of that community by opposing further inward migration by people or businesses and, possibly, any development or refurbishment, including plans put forward by those already located there.
The term can imply a selfish attitude and can be taken as an insult by people who have strong affection for their home locality and wish to protect it from any changes. It is closely related to the NIMBY attitude.
A drawbridge was historically the hinged bridge at a castle's gates providing entry across a defensive moat. Raising the drawbridge to a vertical position was therefore one's means by which intruders could be shut out of the castle.
