If the car insurance salesperson disagrees with you, maybe you should try to understand why? Did you really consider the possible that a tree branch could fall in front of your car or that you could get caught in a hail storm?
If the Apple store employee doesn’t understand why you’re obsessed with box sizes, explain that the MacBook in the smaller box is the one with the features you want and that’s the easiest way to identify it.
If someone gives you a look like “you’re stupid” it’s most likely that they don’t understand your decision not that they think you have an inability to reason. Sometimes you simply need to explain yourself, but it seems the OP has such confidence in their own decisions that they won’t accept any help or input from even the experts. After all as you noted, it appears that the OP has always been right in the end.