Not all of them do, it depends on the social scene for which you belong. If you mix with unpolite people, your reality is this. If you mix with people who have a social code of conduct, this will be your world.
It seems that your world might suggest that this is the case for you.
Women are by nature very sensitive and emotional. The polite behaviour of women can be seen as a God gifted nature and it reflects when they behave with people around with them. Men are more aggresive and politeness is generally not seen in them as compared to behaviour. of women.
Is politeness really becoming rarer?we complain a lot but if you think about your personal experience with adults people still tend to be polite to each other. Maybe they don't know every rule of etiquette, and lets be...