Remove node from multisites?

Here, try this:

add_action( 'admin_bar_menu', 'remove_nodes_from_mysites', 999 );
function remove_nodes_from_mysites( $wp_admin_bar ) {
    $user_blogs = get_blogs_of_user( get_current_user_id() );
    foreach ( $user_blogs as $user_blog ) {
        $wp_admin_bar->remove_node( "blog-" . $user_blog->userblog_id . "-n" );
        $wp_admin_bar->remove_node( "blog-" . $user_blog->userblog_id . "-c" );
    }
}