I haven’t had time to test this but this looks like it should work for you.
add_action('do_meta_boxes', 'remove_thumbnail_box');
function remove_thumbnail_box() {
remove_meta_box( 'postimagediv','post','side' );
}
Check this for more info.
Edit: The main change here is that you need to attach the function to do_meta_boxes instead of admin_menu
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