I didn't say that you did. I said that not knowing the likely consequences of your actions appears to be a common thing in a certain GM-centred approach to play, and posted your example as an illustration.
You said games were not real life. I was just pointing out that in the games I prefer that, much like real life sometimes I have a good idea of what the consequences of my actions will be and sometimes I don't. That's not true of all RPGs.
You're not disagreeing with anyone here. @TwoSix didn't say anything about deciding the consequences of punching the nearest guy in the bar. The question was, rather, whether or not there is a "nearest guy" to punch, and who has the power - as a participant in the game - to make the presence of such a person part of the shared fiction.
Then let me restate. I prefer the D&D default that the authority of a player only extends to what their character says and does.