He did listen to you , i think he was quite reasonable. I know alot of bar owners, 99% of them wouldn't have even let you finish your spiel and would have had bouncers turf your ass.
But don't get me wrong i totally understand your point. Wih some bars its the processing they use.. 3 - $5 orders on the same credit card makes them less money than 1 - $15 order, its as simple as that.. Basic math. The pissed off customer is a ratio in that math equation , but it obviously doesn't affect the outcome..
I mean seriously what did you expect him to say ? "your right that sucks ass , we will remove the min. charge

"
I think what he did was give it to you straight instead of sugar coating it like anyone else would have.