good or bad ?

Every kid growing up heard from his parents or other people at least one time during his childhood : "You are bad!"/"You are good!" or "You've been a bad boy/girl!"/"You've been a good boy/girl!".
The funny thing about this is that nobody really knows what good or bad is because people relate these two concepts based on their country , social status , religion , sex and a lot of other facts so who can say what is good or bad , what is wright or wrong if different people have different opinions on this subject ?
For example , Christians believe that if somebody slaps you on one cheek you should show him the other cheek and not react in a violent way in any situation and further more you should always forgive the person that did you wrong .
On the other hand , for Muslims , if somebody does something bad to them like cheating or swearing , they have other ways of behaving , not wrong , just their way of behaving and reacting .
Muslims can take matters into their own hand in these type of situations and for them ,that is a very good thing because they can do the wright thing in their manner without feeling guilty for what they did .
After this brief example on just how much can the idea of "good" or "bad" can mean different things for different people , I think that being good or bad is really the way that you feel after your every action and the way you go to bed at night feeling happy or sad about the decisions you've made ,that's what being good or bad is really about ... good or bad ?

Just a funny way of looking at things ...