Some people notices the change in our attitude but wouldn't notice the change in their behaviour which led to it!!!

yes we first need to look at ourselves and then expect others to get better at it

Judgemental behaviour of people destroying our peace,and they didn't even realize.

Why are people so judgemental? Because it is the easiest thing to sit on a chair and speak ill of others, find faults with others, point accusing fingers. Self introspection is very difficult. I know from personal experience. But when we reach a certain level of wisdom and understanding, then we will be thankful we took pains to improve on ourselves. We need not be criminals for people to judge us. A girl wearing jeans and T shirt, a girl not getting married, a couple who does not have a child,a man who failed to get a job etc.. are more than enough for people to pass judgement.

people in general are judgemental about others ..because it so easy to be ..

This is very true

This is true, they should look at themselves first