It is completely legal. You write that it is revocable trust; that means the donor/trustee has the right to change it whenever he wants, however he wants, and can remove anyone he wants as a beneficiary.It is voluntary for someone to set up and fund a revocable trust. Your disability does not give you a right to someone else's money (the money the donor put the trust) or to payments from a voluntarily set-up trust. (Remember: they could have not established a trust at all--most people don't--or if they did, had no obligation to make you a beneficiary in the first place.) The anti-discrimination laws apply to employment, housing, and places of public accommodations (e.g. stores, restaurants, bars, hotels) and do not apply to private trusts.