You probably would have received a warning if you had just taken a swipe at another member in the course of a thread conversation. People take jabs at each other here all the time and for the most part, if anything is done, it's just a friendly "please stop the personal insults" comment from one of the Mods in the same thread.
But you specifically started a thread with another members name in the title to call him out. That won't be tolerated from anyone here on the board. If we allowed that then the place would deteriorate rapidly. It's even posted in the Forum Rules section.
Personal attacks, insults, good fan/bad fan posts, and posts started specifically to stir things up here. Offenders will have their account deactivated for a week. At the end of that time, it will be re-activated. If it continues, the account will be pulled permanently.
Since there is no advertising sold here and membership fees are not required, I don't see how it is "bad for business." Sorry you feel it was a joke, but anyone that makes a post like the one you did would have received the same punishment.