Same situation.
The trucker is a driver for a car moving company.
In a tweet the driver said "This guy is a true dick, on and off the course"

Poulter's response:

"This is truly disappointing to read.. Glenn I remember you delivering the car a while back and I have only great experiences from all the drivers at @reliablecarriers. And I was really happy with the service I paid for. The car was delivered as reliable would have expected first class. I guess from now on I will never be using @reliablecarriers ever again to move my vehicles. It's a good job there are lots of good carrier companies to chose from. It's saddens me to write this. Why would I ever have this man possibly deliver another vehicle. You think it would be handled in the same manner as the fist one. I don't think so. Could never take that risk."

Because of an employee's tweet. A customer decided they could no longer use that company's service anymore.

If you were having your car painted and the painter takes to twitter, that identifies the business, and speaks poorly of you. Would you use that same company to Paint another of your vehicles.

This employee did not lose their job because Poulter's used his fame.
It is only a story because of Poulter's Fame.
Employee's being fired because of using company twitter in a way that damages an employer happens many times a day. Yet we only care when it is a famous person and then we blame the famous person.