Those are laws protecting everyone, not classes, like your list shows. Old people are not a class of people, tall people, etc. Messy people are not a class of people. Classes is a loaded devisive word. Everyone is protected from something. You can have all those reasons you list not to sell in your mind, and just let the respond by date in every sales contract expire. Sometimes it is just hours. Nope I need more time to decide, I need five years to think it over, maybe next week I will change my mind, then contract is over at the time end. The broker yells and walks, and you’re done. Or require any number of payment methods etc. Move in date. Nope not work for me. I need two years to clean this up. You can have a listing contract with the broker too, saying you will accept full price, which is not between the buyer and seller. They won’t enforce it, and there are a million ways you can say no to the buyer. As long as you don’t verbalize or write discriminating words, no one can prove what you are doing.
Renting property, giving loans, etc is where discrimination is actively prosecuted I think. You have to rent to a family even if you don’t want to. The family class? The kids are a class? But then the nice older single non destructive woman class has a better credit score, and there is your excuse. As long as you keep your mouth shut about kids in your rental, it is hard to enforce.
Actually the seller can pull the listing any time they want for any reason or no reason. Buyer has no power at all.