So what? They also make worse mistakes that that harmless one (it's not like
who made the original invention matters much, except for proper historical attribution: I think of it in the way we usually think about idea vs execution. The "original invention" is closer to the "idea". It's who put it on our households that did the actual "execution". I can use Linux GUIs, OS X, Windows but could care less about Xerox's original UI).
Also, for some profession or other, we're all laypeople, and make equally bad or even graver mistakes. But we don't care that much about those. A computer geek feels superior to other people for knowing that Xerox invented the modern GUI, but he doesn't feel stupid to believe any number of BS about medicine, economics, literature, etc.