There are a number of customs and gestures that Americans use without thinking twice. But when traveling abroad, they will not only out you as a tourist, but could get you in hot water in other countries.

Inspired by this Quora thread, we've rounded up some of the most common American customs that are seen as offensive elsewhere.

1. Tipping

A contentious issue even here, both over- and undertipping can quickly make you the least popular person at the table. But in Japan and South Korea tipping is seen as an insult. In those countries, workers feel they are getting paid to do their job, and take pride in doing it well; they don't need an added incentive.

2. Sitting in the back of a cab

While it's customary for Americans to hop into the back of a cab, in Australia, New Zealand, parts of Ireland, Scotland, and the Netherlands, it's considered rude not to ride shotgun. Whereas cabbies in the US will sigh and reluctantly move their newspapers and lunches from the front seat, in other countries it's a matter of egalitarianism.

3. Throwing a thumbs-up

In a lot of countries, especially in the Middle East, Latin America, Western Africa, Russia, and Greece, a thumbs-up basically has the same meaning as holding up a middle finger does for Americans.

4. Laughing with your mouth open

In Japan, laughter that exposes your pearly whites is considered horse-like and impolite — sort of like noisy, open-mouthed eating is considered rude to Americans.

5. Calling the USA "America"

In South America, claiming you're from America, rather than the United States, is seen as being politically incorrect, as it implies that only the US should be considered America, and that South America is unworthy of the title.

6. Being fashionably late



Americans often make appointments for "around x" or "x-ish." Being a few minutes late, or, as we even call it, "fashionably" late, is standard to Americans, but unacceptable in many other countries (like Germany) where leaving people waiting is taken as you thinking your time is more valuable than everyone else's.

7. Being on time

On the other hand, many Latin American cultures, notably Argentina, would consider it bad form if you showed up to a dinner party right on time, akin to someone arriving an hour early in America.

8. Having one hand in your pocket

This is considered arrogant in Turkey, as well as some Asian countries, like South Korea.

9. Using your left hand for anything

Not all cultures have or use toilet paper, and tend to use their left hand in lieu of it. Accepting gifts, eating, or doing pretty much anything with your left hand in much of Africa, India, Sri Lanka and the Middle East is like a (disgusting) slap in the face.

10. Opening a present immediately

In most Asian countries, most notably China and India, tearing into a gift in front of the gift giver is poor form. It looks greedy.

11. Wearing sweatpants, flip flops, wrinkly clothing, or baseball caps in public

Sure "athleisure" (stylish sportswear worn outside of the gym) is a hot new trend stateside, but in most countries, notably Japan and most of Europe, this sort of sloppy appearance is considered disrespectful.

12. Altering your meal

In foodie cultures like France, Italy, Spain, and Japan, asking for ketchup, hot sauce, soy sauce, or salt to alter your meal may raise some eyebrows. Before you ask for a condiment, see if there are any on the tables — if not, you should probably refrain.

13. Showing the soles of your feet

In many Arab, Muslim, Hindu, and Buddhist countries, showing the soles of your feet is a sign of disrespect, as they're considered the lowest and dirtiest part of the body, since they touch the dirty ground. Men should cross their legs with caution.

14. Keeping your shoes on



While you probably think you're doing the world a favor by keeping your socks under wraps, in most Asian and Caribbean cultures it is expected that you take your shoes off when entering someone’s home.

15. Drinking someone else's alcohol

Apparently, it's rude to drink alcohol you didn't personally bring to a party in Norway. In the US, on the other hand, bringing a six pack of beer to a BBQ allows you access to anything else at the event.

16. Men showing some skin

It's rare to see topless men in South Korea, where men even keep their shirts on at the beach.

17. Eating anywhere that doesn't serve food

In Rwanda and Japan, it is considered rude to eat anywhere that isn't a restaurant, bar, or hotel. Eating a banana on the bus? Ice cream outside? All no-nos.

18. Telling people to help themselves

While you think you're being a host extraordinaire by opening up your home to someone and essentially telling them to feel right at home, in some cultures (like in Asia) this hands-off approach is uncomfortable. To them, hosting guests is a little more involved.

21. Asking certain questions



Asking "what do you do" is a common American icebreaker, but is often considered insulting, especially in countries with social-welfare systems, like the Netherlands, where people feel that it's a way of pigeonholing them, and of being classist. You might as well just ask someone you just met what their salary is.

22. Refusing food

Americans often refuse food to make it easier for their hosts, but in most Arab countries, like Lebanon, it is considered incredibly rude to reject anything offered, especially food.

23. Not declining gifts

Americans are quick to accept gifts, favors, and invitations, and often without offering something in return. However, many cultures (like in Japan) expect you to decline things a few times before ultimately accepting them. In China, you're even expected to refuse a gift three times before accepting it.

24. Polishing off your meal

In countries like China, France, Japan, Saudi Arabia, and Turkey, blowing your nose in public is not only rude, but considered repulsive.