[@robin-w Moderator 8 years, 8 months ago]

this does that

add_filter( 'bbp_get_reply_content', 'rew_remove_code_tags', 10, 2 );

function rew_remove_code_tags ($content, $reply_id) {
	if (!is_user_logged_in()) {
		$content = preg_replace('~<code(.*?)</code>~Usi', "", $content);
	}
	
return apply_filters( 'rew_remove_code_tags', $content, $reply_id );
}