Disable comments except for all post types except for the ones specified in $enablecomments

wp-remove-comment.php

<?php
global $enablecomments;
$enablecomments = array('');

// Removes from post, pages and custom posts
add_action('init', 'remove_comment_support', 100);
function remove_comment_support() {

    global $enablecomments;

    $myposttypes = get_post_types();
    foreach ($myposttypes as $posttype) {
        if ( !in_array($posttype, $enablecomments) ) {
            remove_post_type_support( $posttype, 'comments' );
        }
    }
}

// Removes comments item from admin bar and admin menu if no post type has comments
if (empty($enablecomments) OR $enablecomments == array('') ) {

    function my_remove_admin_menus() {
        remove_menu_page( 'edit-comments.php' );
    }
    add_action( 'admin_menu', 'my_remove_admin_menus' );

    function mytheme_admin_bar_render() {
        global $wp_admin_bar;
        $wp_admin_bar->remove_menu('comments');
    }
    add_action( 'wp_before_admin_bar_render', 'mytheme_admin_bar_render' );
}
?>