People reaction to success... What you think?

Some people can't be happy for someone, they always find some reason to hate more successful people...

And also many successful people become uppish and nasty after they get success...

It's like a stick from two sides - one depends of another...

People hate because others are nasty and that others are nasty because people hate...

Who started acting wrong? First group - jealous people or second group - successful people?

What you think who is more guilty?