Emotional
Unfair treatment you receive (eg there) is painful, but it could mean you are no longer needed in your workplace. Do not cry, scream, beg you to get your job back or angry at someone. Not at all. Although it is difficult, leave your job with a smile on your face, If you can not hold back the tears, settle down on the toilet until you feel calmer. Then go back gracefully when you return to the room. You never know whether you will want to work for the company, or the people in it, again. Do not bury all of your accomplishments only because of the emotional moment.
Honest
Before you leave the company, according to the procedures of HR will talk to you about the experience at the company and the reason for resigning. The interview can be a confidential opportunity to provide constructive criticism. Most likely, you want to express all that is in your mind. But do not get caught. Anything you say can and will ensnare your colleagues. This is the source of a problem if you are working in a small industry and you are again met with the same people again. Plus, comments about the boss excruciating or unrealistic expectations may be able to make the kind of person you are perceived as a complainer, This can be detrimental to you, if you are looking for a position in the company again. The best advice for your resignation interview is to focus on the positive.