Well you can think all you want whatever you want but not even the rules of a corporation can violate an individual's rights to their property. As the owner of the clippers he has been banned from all NBA activities he can no longer watch a game of the team he owns. I see that as a property rights violation.
Let's define personhood.- "Persons" are one of the two main classes which are the subject of rights, powers, and duties, the other being "citizens". Persons may be "natural" or "corporate". "Citizens" are a subclass of "natural persons". Each government may also establish, within its jurisdiction, "corporate persons" such as governmental entities, associations, trusts, corporations, or partnerships, in addition to the Common Law "natural" persons, but the "personhood" of such corporate entities is not created by the government. Its corporate personhood derives from the personhood of its members. Corporate persons must be aggregates of natural persons. Corporate persons must aggregate not violating individual basic natural rights. Sterling is an asshole but an asshole with rights. The NBA in its attempt to distant itself from a known racist may have gone over the top and violated Sterlings constitutional rights in the process.