Re: Wrong to kick him out
We have a business entity telling someone what they can an cannot say in their spare time, away from that entity.
This isn't just some random "business entity" telling random "someone" what they can say. It's a Board of Directors enforcing the Code of Conduct for a member of that Board. That's significant: Directors represent the organization when they interact with the public. The concept of "away from that entity" is limited. This responsibility is part of the job.
tl;dr: Directors should not "troll" their stakeholders (investors, employees, public, customers...) Salespeople should not "troll" their stakeholders (customers, boss). If you do, accept the consequences.