Something bad happened and I'm not sure what to do?

Ok, I'm sorry if this is a little long but I'm just looking for opinions on what I should do.

I was out last night with my two girl friends (J) and (L) and we went to this place called 'Riverfront' in Ft Lauderdale FL.. its essentially a few blocks with a bunch of bars/restaurants/lounges/night clubs all along the main streets. Ok, so we started out at this place called 'Capones' and we had a drink each there.. then we were crossing the street to go to this place called the 'Art Bar' to dance when this dude approaches us with these flyers that entitle women to a free entrance and one free drink. We had never heard of the place but it was literally 10 feet away from us so we decided to pop in and grab our free drink before continuing to our next location. Ok, so the way this place was doing it was that when you give the hostess your flyer, she hands you a cup, in which is supposed to go your complementary cocktail. Fine, I gave my cup to one of my girfriends (J) as she was gonna hang on to them so we could just get our drinks faster. So, we get to the bar and the bartender pours us the drinks and says we owe him $3 for each drink.. to which my friend (J) shows him the flyer with the advertisement and points out the 'Free Drink' offer. He said that he didnt care that we had to pay it.. we were put off but were going to pay anyway.. I mean, its only three bucks. The only problem was that we were a buck short since we had used most of our cash on a meter for parking. We offered him a credit card but he refused to take it, his exact words were: Thats not good enough, I want cash. So when we didnt have it he dumped two of the three drinks out on the counter in front of us. At this point I just turned around to leave because honestly the drinks didnt mean that much to me anyway.. they were free and probably mostly water anyway. But at the moment that I turned to leave my friend (J) threw her drink at him. He jumped over the counted, grabbed me by the neck and slammed me into my other friend (L), he then threw (J) on the floor and dragged her out of the place all the while shoving myself and (L) out of the lounge. At this point I didnt really know what was going on.. I just wanted to get away from that guy.. I spoke to two different police officers who were outside and they both discouraged me from filing any reports claiming that no one would care that he put his hands on me and that it would be a huge waste of time. I went home feeling violated and woke up today extremely angry.. I am a few minutes away from going to file a police report and tomorrow I intend on speaking to a lawyer.. is there anything else I should do to make sure this maniac isnt treating people like this???