Oh, yeah, customs and etiquette differ from one culture to another. Each country has its own specific customs and politeness rules. What may be perfectly innocuous in one place may be hideously offensive in another and, vice versa, something that sounds rude in one country may be the most polite thing to do in another. So, yeah, politeness rules vary in different parts of the world making a person with a certain type of behavior either polite or not.