Am sure you have come across something typical of a particular country or people or race or have it pointed out by someone. Here are some that I have come across.
We also don't belong to the tissue culture much, preferring handkerchiefs instead. Then comes the IST, also known as not being or starting things on time. Our clothing is full of colours and cheerful prints, unlike in some of the countries I have seen. Most of their clothing are in only so many colours and that too without any prints. Maybe this is the reason why so many non-Indians say that India is so full of colours and vibrant too.
Malaysia has its own version of IST and it is called elastic time.
In Australia, women are referred to as Sheela. The ladies' rest rooms mention "Sheela" instead of "Ladies".
In Europe, and maybe in other countries too, I could never understand why winter coats are predominantly black in colour. One does spot a red coat or a white coat but it's a very rare sight.
Care to share the idiosyncrasies you have observed?