In a free world, nobody would be forced to associate with someone else against his will. In a free world, nobody would be forced to buy from someone against his will. In a free world, nobody would be forced to sell to someone — or hire someone — against his will.
In a free world, all associations are voluntary. In other words, if any transaction is forced — for either party — that is not a transaction between free people.
Free people have liberty to make their own decisions — whether I agree with their decisions or not. Free people can be kind and loving if they choose. Free people can be open-minded and decent. But free people can also be hateful and mean-spirited if they choose. Free people can be greedy if they choose.
If human beings are not free to make their own decisions about their associations, they are not free people. Whoever dictates what their decisions must be has taken away their natural right to live as free men and women.