If he held his opinion purely in the public sphere, I'd agree with you - but he posted it in an internal companywide manner that directly impacts how he'll be able to work with his coworkers.
Being divisive at work isn't good for business.
Being divisive at work isn't good for business.
The above sentence is a fact but I am compelled to write it with a throwaway account since even mentioning the idea that this may have been unfair puts my career at risk. That's how bad it's gotten.