If you’d said ‘prequalified WHITE buyers’ you’d have been in a world of hurt.
No, they'd just have refused to do business with me, which is their right. I didn't have to say "white."
Now lets assume for the sake of argument that's what I meant, and the realtor (who knew what I meant) brought me an "unqualified" buyer. I'd terminate the real estate contract with that realtor for breach of contract.
If they were dumb enough to sue for my terminating the contract. they'd have to defend their acceptance of the contract in court in the first place.
No real estate agent wants to go on record as having to defend themselves from discriminating against proposed buyers, that'd put them out of business.
As for me, I'd list it with another agent with the same terms. Which again, they're free to refuse to do.
You just have to know how to play the game, and you'd be naive to think real estate agents don't do it all the time.
The real estate agent who sold me this house I'm in now (a dear friend of the family) also showed me plenty of others that I initially liked. Anytime I said I liked a house, she'd take me for a drive around the surrounding area and start asking me questions about what I was seeing. In essence, she was showing me how to "qualify" a neighborhood before In purchased a house in it.
As I said happens all the time.