Both guys were either ignorant or messing with you.
It is possible for scopes to have the up-down and right-left marked backward, but it's rare. I've had one such scope in all the decades I've been fooling with them, a prototype 3-9x from a well-known firm.
Also, some European scopes have turret adjustments that turn the opposite way most American scopes do for up/down and right/left, but I've yet to run into one with the turrets marked for the wrong direction.
