add_theme_support( $feature=’menus’ )

From the documentation for add_theme_support():

The following parameters are read only, and should only be used in the context of current_theme_supports():

So your theme shouldn’t be using add_theme_support($feature="menus") to begin with. Support is automatically added by register_nav_menu(). If you don’t want menu options for your theme, make sure you’re not using register_nav_menu() anywhere.