So I have had this issue recently.
I did 2 things.
To disable the feed issue I actually went in and disabled the RSS feed in WordPress.
1.
I edited the default-filters.php file as discussed here
I just commented out line 200 to 203 as below which stops feed links appearing in the <head> section.
// Actions
add_action( 'wp_head', 'wp_enqueue_scripts', 1 );
/*add_action( 'wp_head', 'feed_links', 2 );
add_action( 'wp_head', 'feed_links_extra', 3 );
add_action( 'wp_head', 'rsd_link' );
add_action( 'wp_head', 'wlwmanifest_link' ); */
add_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0 );
add_action( 'wp_head', 'locale_stylesheet' );
add_action( 'publish_future_post', 'check_and_publish_future_post', 10, 1 );
add_action( 'wp_head', 'noindex', 1 );
add_action( 'wp_head', 'wp_print_styles', 8 );
add_action( 'wp_head', 'wp_print_head_scripts', 9 );
add_action( 'wp_head', 'wp_generator' );
add_action( 'wp_head', 'rel_canonical' );
add_action( 'wp_footer', 'wp_print_footer_scripts', 20 );
add_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );
add_action( 'template_redirect', 'wp_shortlink_header', 11, 0 );
add_action( 'wp_print_footer_scripts', '_wp_footer_scripts' );
add_action( 'init', 'check_theme_switched', 99 );
add_action( 'after_switch_theme', '_wp_sidebars_changed' );
2.
The other thing I did was replace » with »
I didn’t actually do this with the >> mark, but I did it with ® to ® and it worked out for me.
If you work out how to remove the » from the WordPress feed URL then that would be great, do tell.
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