Because you live in a society that mostly functions because people mostly don't discriminate against each other, and the conditions which result in you being able to open a fruit stand for personal profit would be basically impossible without that.

Luckily, this is mostly the case today, and for the cases where it's not eventually a law gets passed, so there's theoretically no reason for a broader law assuming that we don't... assuming that the goal is eventual consistency, so to speak.