Not true.
It took a couple supreme court cases to firm it up, but the Civil Rights Act of 1866 prohibits all racial discrimination in the sale or rental of publicly or privately held property, without exception, whether facilitated by a real estate agent or not.
The 1968 civil rights act added the Fair Housing Act which provided further discriminatory practices, including within advertising.
If I had seen this ad as a white person, I would’ve requested the room and filed a HUD complaint after not getting it.
$16,000 on first offense through an administrative HUD complaint.
You meant 1966, correct? Trying to head off the spelling/detail police!