I have a similar experience while looking for a place to rent. A few private landlords said "no foreigners", one refused to believe my female S.O. made median wage for a man in our city and demanded to see her tax documents, and one tried inserting a clause into the lease saying I'm not allowed to cook "ethnic foods" (lmao).

At that point even the realtor was shocked at how shitty these people were being and referred me to a big corporate landlord. They asked to see my ID, my pay slips, and then handed me their standard terms and conditions. I moved in that week.

I am in no way defending any landlord ever, but sometimes being just another number can work to your advantage. Numbers don't have skin color or nationality or gender.