Hide meta box for everything BUT a certain custom post type

Why not just turn off the default tags capability then register a tags taxonomy specific to the custom post type?

http://codex.wordpress.org/Function_Reference/register_taxonomy

register_taxonomy(
  'my_custom_post_type_tags',
  'my_custom_post_type',
  array(
    'label'        => __( 'Tags' ),
    'rewrite'      => false,
    'hierarchical' => false,
    'capabilities' => array( 'edit_terms' => 'manage_categories' )
  )
);

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