The "who did it first" stuff is always one of the most aggravating tangents in tech forum discussions. I truly just do not get it. Sometimes it's people reminiscing about computer history, which I usually enjoy, but most of the time it's someone who just wants to crap on whatever the thing being discussed is. It's a less downvotable way of saying, "I think this thing you just wrote is stupid, and my token excuse for saying this is because someone else did it before you, so nyah nyah nyah".
The canonical example IMO is the development of the modern GUI: in the '90s, people who liked to argue about dumb stuff would say that Windows is crap because it was "just a reimplementation" of Mac OS; this was usually followed up by some equally stupid argument from someone else about how the Mac was stupid because it was "just a reimplementation" of the Xerox Alto, and I'm sure that would be followed up by some primordial neckbeard claiming that the Xerox Alto was a steaming pile because it just a reimplementation of ENIAC with better graphics.
Also: GNU/Linux.