Well ... y'know ... you
were the one who posted in the first place. You've got enough time on this board under your belt that you surely must have known that not everyone would instantly and totally agree with you! If you did think that you were 100% correct and that there was no room for error in how you read the situation, then I for one am glad to have helped you on your road to enlightenment!
And, to be fair, the "total stranger" at the restaurant did
not "approach you to tell you that the food on your plate is gross." They approached you to tell your daughter what the orange stuff on her sushi was. And when your daughter "looked at her in horror", the stranger went on to commisserate with her by saying, "I know! Isn't it gross!" I'm sure that if your daughter had reacted with, "Oh my gosh really? Cool!", the stranger's response would have been quite different.
And ... well ... you DID technically "use trickery and deception to get [your] daughter to eat something she did not want to eat." You said yourself that "if we shared that detail while we were eating to my picky eater daughter she would not eat any more" (indicating that you knew she was eating something she would not eat if she knew what it was), and that instead of answering her question, "We just sort of changed the subject" (indicating that you hoped that maybe if you didn't answer the question, your daughter would just keep eating -- a common trick used by parents the world over). So yeah ... you may not want to admit it, but you tricked and deceived her. Not in a horrible axe-murderer kind of way, but trickery nonetheless. Kind of like all those parents who say, "No honey -- the drop on Splash Mountain isn't that bad at all."
And just because YOU haven't met a best friend through a chance encounter at a restaurant certainly doesn't mean it's impossible.