Remove AddThis from specific custom post types in WordPress.

functions.php

<?php
//* Remove AddThis from specific custom post types
add_filter('addthis_post_exclude', 'amn_addthis_post_exclude_filter');
function amn_addthis_post_exclude_filter($display) {
	if ( in_array(get_post_type(), array('custom_post_type_1', 'custom_post_type_2','custom_post_type_3')) )
		$display = false;
	return $display;
}