rp4wp_disable_rposts_on_certain_categories.php

function rp4wp_disable_rposts_on_certain_categories( $display ) {
	global $post;

	// ID's of categories you wish to exclude of displaying posts
	$excluded_categories = array( 96, 100 );

	$terms = wp_get_object_terms( $post->ID, 'category' );
	if ( ! empty( $terms ) ) {
		foreach ( $terms as $term ) {
			if ( in_array( $term->term_id, $excluded_categories ) ) {
				$display = false;
				break;
			}
		}
	}

	return $display;
}
add_filter( 'rp4wp_append_content', 'rp4wp_disable_rposts_on_certain_categories');