Next thing you'll be criticising laws against employer discrimination. If someone wants an all white company, what's wrong with that? You want to force employers to hire people they don't want?
Same with the tenants. I might prefer to rent my property to a woman because she takes care of the place better and is less likely to throw a party. Is that a discrimination?
Point is if there's an objective reason behind it then it's hard to consider it discrimination, even if it segments the groups on race/gender/religion.
The problem is quite complex and hard to solve in one shot.