An employee organization entering into an agreement shall not:
(1) discriminate against a person seeking or holding membership therein on account of race, color, creed, religion, age, disability, sex, sexual orientation, gender identity, or national origin;
(2) penalize a member for exercising a right guaranteed by the Constitution or laws of the United States or the State of Vermont; or
(3) cause or attempt to cause the discharge from employment of employees who refuse membership therein because of religious beliefs.