Under the Equal Credit Opportunity Act, it is illegal to discriminate in any credit transaction:
On the basis of race, color, national origin, religion, sex, marital status, or age, because income is from public assistance, or because a right was exercised under the Consumer Credit Protection Act.
If you believe you have been discriminated against, you should send a complain to:
National Credit Union Administration
Office of Examination and Insurance
775 Duke Street
Alexandria, VA 22314-3428