Welcome to the Corporate State where every problematic statement you make as an errorful human being prone to making mistakes will be used against you to preserve the corporate bottom line.
An actual appropriate response from SendGrid and Play Haven would have been recognition that its employees are human's first, and all of us are subject to making mistakes of one form or another. That they back their employees, and support them, even as they disagree with their statements or their behaviors.
I detest what you write, but I would give my life to make it possible for you to continue to write
It is ironic, it is tragic that SendGrid, an email delivery company, chose to fire an employee expressing speech, as opposed to just offering more speech in rebuttal.
The answer to the ugly free speech of Adria Richards is more speech, not firings.
(Yes, Hacker News, downvote my comment. Make sure a reasonably stated position that disagrees with you is shown its place.)