I don't know if that's illegal, but it's certainly OUTRAGEOUS. I hope another lawyer will have a good idea to help you. The law forbids discrimination based on sexual orientation. It may not protect you because of your association with someone else based on their orientation.
-Alex J. Higgins
It's not clear what the situation is. Does your daughter work where you work? If not, why is she at your workplace? Why does anyone at your workplace know anything about your daughter's private conduct and personal relationships?
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Washington law prohibits discrimination based upon sexual orientation/gender identity. I am not positive about its application when you are being discriminated against due to your child's orientation. I would strongly urge you to contact the Washington State Human Rights Commission. You can find that organization here: http://www.hum.wa.gov/ComplaintProcess/Index.html or call their Spokane office at this number: 509-568-3196. Do not hesitate, because there is a strict timeline during which you qualify for their assistance.
I suggest that both you and your daughter start with a complaint to the Washington State Human Rights Commission and quite possibly to the ACLU (for your daughter). I further suggest that you end your communication on this on public website and meet with an attorney in the Spokane area ASAP. The closest attorneys I personally know who do civil rights and plaintiff employment are in Moses Lake - Ronaldo Delgado - Delgado law firm. This is outrageous to me and I wish you the best of luck.