how not to display related posts on a page??

Hello
yes you can do this:

add_action( 'wp_head', 'remove_mrp' );
function remove_mrp()
{
  if ( is_page( 'foo' ) ) {
    remove_filter( 'the_content', 'bawmrp_the_content' );
  }
}

Also if the posts are showing up under the pagination, change the priority :

remove_filter( 'the_content', 'bawmrp_the_content' );
add_filter( 'the_content', 'bawmrp_the_content', 5 ); // 0 to 9