[Boxsford]

(He)was told that my actions reflected badly on the company and that a client was upset,” Mr Hiller said.

Looks like he was fired because of a client. Its business.

[Hermann the Cherusker]

Graphic designer Glen Hiller, of Berkeley Springs, West Virginia said he was told that he had embarrassed and offended a client who provided tickets to the event.

That paragraph is even more telling. The upset client provided him the means to attend the event.