What this sounds like to me, beneath all the bickering is that OP tried to leave somewhere with an alcoholic drink that may not have held an off sales licence and the bouncer tried to stop him leaving with the drink, which he is entitled to do. I do not know whether the use of force was justified, nor will anyone else in this thread as we only have the OP's account of what has happened, which will no doubt be biased in the OP's favour.