add_filter( ‘woocommerce_package_rates’, ‘aviweb_hide_free_shipping_class’, 10, 2 );

function aviweb_hide_free_shipping_class( $rates, $package ) {
echo $in_cart = false;
foreach( WC()->cart->cart_contents as $key => $values ) {
$product_id = $values[‘product_id’];
if ( $product_id == 2 ) {
$in_cart = true;
break;
}
}
if( $in_cart ) {
unset( $rates[‘flat_rate:7’] );
}
return $rates;
}