It is not my "right" to live in your property or work in your business, regardless of the grounds on which you choose to reject me. The right to private property has always included the right to exclude whomever you wish. Freedom of association includes the right not to associate.
Is homosexuality considered a protected class in Colorado? If so, is sexual orientation in general, whether gay or straight, also a protected class? Otherwise, it would be ironic if a gay property owner could discriminate against a straight renter, but not vice-versa.