This can be if your employer does any of the following things based on one of the illegal grounds of discrimination listed above:
Employment Relations Act 2000, s 104
dismissing you or disadvantaging you in some way
refusing you, or failing to offer you, the same:
terms of employment
conditions of work
fringe benefits
opportunities for training, promotion, or transfer as other employees with similar qualifications and in similar circumstances
requiring you to resign or retire.
For some examples of disability discrimination cases where the worker took a personal grievance, see the chapter “Disability rights” under “Employment: Access to jobs and protection against discrimination”.