Laughing style of an individual expresses his/her nation's laughing style, is it right? In other words, laughing style is helpful to describe an individual's ethnicity.
Yes, laugh is culturally constructed phenomenon, so, laughing style reveals not only particular features of the individual, but also general, national.
Also the conditions or situations in which one laughs or smiles varies in relation to culture to some extent. For example, in some cultures it is common to laugh or smile when embarrassed while in others it is not usual.