Something still sounds off. . . the part that makes me think we are getting the one side of the story. It reads like a B-movie where two yankee out-of-towners walk into a southern redneck bar as the jukebox screeches to a halt, all of the cowboys stand and stare, and somebody in the back yells, "You boys ain't from around here, are ya'?"
Somehow just your presence ticked off an entire restaurant full of people, and they were united against you? There's something missing.
- Had ya'll been drinking (even a little)?
- Were you wearing anything controversial or that would have made you stand out (covered in Confederate flags / had a sweater tied around your neck over a button-down shirt with khakis and penny loafers / carrying a giant double-cassette deck boombox on your shoulder)?
- Were you goofing on people, even to each other so that you thought they couldn't hear you?
- Were you being loud and obstreperous?
- Even if you didn't start it, when you noticed that somebody was irritated with you - did you reply with words of escalation (insults, jokes, arrogance, etc.)?
Analyze these things. There might be something there that you missed - a reason that you brought so much attention to yourselves and weren't able to enjoy your meal like every other patron in the restaurant.
I'm honestly not trying to turn a victim into the BG. . . I'm not saying you were asking for it. Just evaluate the whole scene and see if ya'll played a role in this getting out of hand.
How were you carrying your firearm? I'm guessing from the context that it wasn't in a holster. Was it tucked into your belt? In your pocket? Cargo pocket? Backpack? Regardless, I wholeheartedly second the recommendation that you invest in a quality concealed carry holster and check that it fits properly with your style of dress BEFORE putting that round in the chamber. (As soon as you do that, get that round in the chamber!)
BTW, I hope you notice that this community is very polite and helpful - and extremely analytical. There's a plethora of backgrounds and experiences which lead to some interesting perspectives. Nobody is picking on you (mainly because you weren't using a Glock).
Welcome aboard!