[WordPress/Filter] Exclude specific category from your blog

functions.php

<?php
// Exclude 'example' category from your blog

function my_get_terms_args_exclude( $args, $taxonomies ) {
	if (!is_admin()) {
		$cat = get_category_by_slug( 'example' );
		if ( is_object( $cat ) ) {
			$args['exclude'] = $cat->term_id;
		}
	}
	return $args;
}
add_filter( 'get_terms_args', 'my_get_terms_args_exclude', 10, 2 );

function my_get_the_terms_exclude( $terms, $post_id, $taxonomy ) {
	if (!is_admin() && is_array($terms)) {
		$_terms = array();
		foreach( $terms as $key => $term ) {
			if ($term->slug != 'example' ) {
				$_terms[$key] = $term;
			}
		}
		$terms = $_terms;
		unset($_terms);
	}
	return $terms;
}
add_filter( 'get_the_terms', 'my_get_the_terms_exclude', 10, 3);