In marketing this is known as "reference groups" -which is a person or a group of people that significantly influences the individual’s behaviour by providing standards or norms by which consumers judge their attitudes and behaviour. In real life it is know as opinion of the others and it's not a secret, that in different groups we behave differently in order to show that we belong there. Sadly, it will never change. Luckily for them, there are people who feel comfortable in almost every society. Me, I don't feel comfortable when I meet crazy people, because I never know what to expect, but luckily this doesn't happen too often.
