WooCommerce - Filter payment gateways

<?php
// WooCommerce - Filter payment gateways
add_filter( 'woocommerce_available_payment_gateways', 'custom_available_payment_gateways' );
function custom_available_payment_gateways( $gateways ) {
  $current_user_id = get_current_user_id();
  $bad_lad_id = 1; // user id for the customer who can't have COD
  if ( $bad_lad_id == $current_user_id  ) {
    unset( $gateways['cod'] );
  }
  return $gateways;
}