We're. It talking about government funded anything here. The student organizations are self-funded and only seek the same accommodation other groups have. Tax exemption of religious organIzations is NOT "taxpayer funding" or support, but a true separation issue between government and religion - the State should not put its hand in the collection plate of the church.
Freedom of association is a basic right and government anti-discrimination acts are a violation of it in every case. A private group has the inviolable right to establish its criteria for association and cannot justly be forced to accept anyone - to do so is a violation of conscience and the assertion of privilege over right.