This happens when a high performer enters an environment of low performers. They know there was a reason for you being hired and feel threatened. In my experie

This happens when a high performer enters an environment of low performers. They know there was a reason for you being hired and feel threatened. In my experience, the best approach isn't to attempt to change the world immediately but to head straight for the most important decision maker and point out the problems with concrete solutions. If it doesn't work, resign. Eventually they will get the picture but a high performing new hire shouldn't have to suffer.