In all fairness to Radiant techs everywhere (and no, I'm not one either, but I was an Ibertech tech), it sounds like you just got some tool from another dealer who was not properly trained in even the basics by his own dealership.
When I worked for an Aloha dealer years ago, they were constantly burning through idiots, trying to fill the same position with employees who last a month or two. Some had basic computer knowledge and just didn't know Aloha (that can be fixed), but sadly most of them that got hired just seem to have little knowledge in the field of information technology in general, and were largely incompetent (it doesn't take a college degree to bring a keyboard with you on a call or grab one off the back office).
Unfortunately, I attribute this to the fact that POS is the on the severe bottom end of the pay scale when it comes to IT Professionals. I rarely met a tech making over $45k and year, and most seem to be in the hourly range of 15-17 dollars and hour. That's unfortunate, because in the last 10 years I've watched the industry grow to the extent that it takes a wide range of knowledge to support a modern system- it's seems like you need to know a little of everything, whereas it used to be that basic networking skills were enough.
Anyway, I've seen my share of people walk through the door that were touted as being very knowledgeable computer geniuses or certified in X, Y, and Z- that couldn't seem tie their own shoes without something catching on fire. I'll take someone with no prior experience but who can follow directions really well, over one of these so called super techs any day.