I never heard anything about this at all til this thread. Did some googling and found this article.
Maybe there's more details elsewhere and maybe he went way over the line. I have no clue what really happened, but the article makes it sound like he cursed at a ref after a game. Given that's not that uncommon for coaches, I guess he crossed a line or someone got overly sensitive about something. Probably a bit of both.
Also, what exactly is the punishment? Is the punishment just a "hey, he did this and were giving him a 'public reprimand'?" Or is there something that is part of a public reprimand that I'm not aware of?