[Jetpack] Remove Comment form from Carousel View. It will also remove the comment from all Attachment pages.

functions.php

function tweakjp_rm_comments_att( $open, $post_id ) {
    $post = get_post( $post_id );
    if( $post->post_type == 'attachment' ) {
        return false;
    }
    return $open;
}
add_filter( 'comments_open', 'tweakjp_rm_comments_att', 10 , 2 );