I find the 'not going to take further action' telling, not to mention the bad taste of making fun of your employer publicly.

Seems mostly immature and passive-aggressive to me.

Aside from the criticism of the company, if I'm a manager I'm probably saying we don't need immature, passive-aggressive people on the team.

Personal opinion, but I'd probably not complain publicly about being terminated, unless the company broke the law regarding my termination.