No. If you think that the landlord is treating you differently because you fit into one of these categories, contact a lawyer (see the resource Find Legal Help and/or the Fair Housing Council of Oregon).
There is one exception to the general rule stated above: a landlord can discriminate based on sex when the landlord rents a space in the landlord’s own residence and all occupants share some common space within the residence. 42 USC §§ 3601-3617, ORS 659A.421(8).
It is not legal to refuse to rent to a person with disabilities because that person has an animal that is needed to help this person due to a disability. Landlords cannot charge additional rent or fees for a service or companion animal.
State law also prohibits discrimination because of a tenant’s source of income (for example welfare). State law prohibits a landlord from discriminating against applicants and tenants with Section 8 vouchers or other forms of government rental assistance. ORS 659A.
For more information about discrimination and Section 8 vouchers, see these video resources: http://oregonlawhelp.org/issues/housing/section-8-housing-discrimination