I doubt a similar baking mistake would get a similar response than a wrong-order mistake in a restaurant. Maybe it does, or maybe it doesn't, but making a prediction from one to the other based on such little evidence... well, the person who gets tested really is the one doing such a test, and it does not look good. Okay, there's an A for effort, at least he tried it at all.
I'm sure the very-negative case works, if he freaks out or becomes too obsessed over such a mistake that speaks against the person. But the cases you described sound pretty tame, if he merely asks for the mistake to be corrected that in itself isn't noteworthy. I certainly don't see it as being useful for determining what he would do if there was a similar mistake in the bank business. The context is totally different.
Honestly, I'm the guy who would just "roll with it" and eat whatever was brought to me because I honestly can't bring the energy to arguing with the waiter.
But having hired people and other professionals, I almost always hire the person who would assert themselves and demand the right thing be done.
Why?
Well, I recognize that I don't like to be "that guy". So I hire people who can do it for me. It has always worked out quite well in the past, where I've been able to form a team of people who work well together, but can be assertive to external groups. (And I, of course, only need to get out of their way.)
This is a false dichotomy, not to mention plenty of people who _are_ abrasive and rude to service workers would probably have the smarts to not do so in that situation... Kindly mentioning that the order was wrong (especially in the case of an allergy/health issue) shouldn't be seen as assertive or demanding and I hope that's not what they were implying!
It's knowing P(A|B) and trying to obtain a P(A|C) where B and C are mostly disjoint, making the info not too useful.
Depending on what was brought I might not even be confident that they messed up the order-- e.g. if what they brought was also something that I credibly could have ordered.
I hate dark patterns in dates, that was a date. Learn to communicate and choose that.