Update
A friend achieved to perform this operation by doing the following;
$remove_value = 'lu_ban_settings_pointer';
$meta_data = get_user_meta( $user_id->ID, 'dismissed_wp_pointers' );
if (isset($meta_data['0'])) {
// //at end (or mid) //at beg (or mid) //failsafe
$new_val = str_replace(array(','.$remove_value, $remove_value.',', $remove_value), '', $meta_data['0'])
update_user_meta( $user_id->ID, 'dismissed_wp_pointers', $new_val);
}//end isset meta_data 0
However, I think that there should be an easier way of achieving this, why would WordPress make it so difficult to delete a comma separated value in a user’s meta data.?
