I think, in order to lead a happy life it's not about mean or being nice, or bad or good, it's about being smart.
However, I would say that it is smart to try to be nice or good.
I used to be pretty bad. I think I was pretty bad until I got smarter and 'grew up.'
Now I try to be good most of the time.
Why? Simple.
If you think about your actions and say to yourself 'would I like what I've just done to happen to me?' and if you think not, then you probably shouldn't have done it.
All you have done is increased someone elses misery and you don't get anything good back in return.
If you try to be good or nice to most people, generally, they will be nice/good back to you in return.
I know this from experience. It's kinda like 'what goes around, comes around.'
Because it does.
Most 'assholes' and 'dickheads' who think you are stupid, will try to exploit you, but if you are smart, you will know what to do about it.
And if we all tried to be a little nicer, the world would be so much of a better place. And I think we'd all be a little happier.
That is smart to me.
Do we all want to be part of the misery ?
Or do we want to try to make the world a little better in our own little way.
Seems pretty simple to me, really.
Now, I'm off to work for the day.