I think people get annnoyed because other people doesn't listen thier saying, = I think people get annnoyed to others because they aren't listening.

Listen carefully is important. = It's important to listen carefull when someone is talking.

But sometime we don't listen it and even don't anwser to thier talking. = But sometime we don't listen and respond to them.

Also we disagree thier opinion and say opposite opinion. = Also we disagree to their opinion and say opposite thing.

If people realize that they are feeling bad. Finally they become annoying. .....may be.