I had a coworker that was an Air Force pilot (99% certain he was telling the truth as I was working for a government contractor and he had security clearance so I'd be a little surprised if he fooled HR and our whole team). Thing is... He genuinely believed the earth is flat. Whenever anybody would ask "haven't you seen the curvature of the earth? Like... More than once?" He'd respond with "yes I have, what's your point?". Uh.... Okay.

Didn't help that he also was convinced cpp is the only language you ever need for any project. Like, "what if instead of building a web API and two separate native mobile app frontends (Swift/Java)... We instead build our own proprietary C++ framework that somehow runs on IOS and Android and we can also use it for our Backend instead of .Net?"

I'm not saying I love Java or Swift or that at some point I haven't thought about why we can't just use cpp in both, but you're supposed to grow out of that kind of thinking. I think every noobie or college students thinks "oh there's got to be a way". But at some point in your career you realize even if you could, it wouldn't be any easier to use and the performance gain would crazy small compared to amount of effort and you'd be playing catch up with both IOS/Android forever.

But no matter how many times we'd shoot it down, he'd keep bringing it up. And he wasn't straight out of school or something. He had like 20 years of programming experience.

I don't have a lot of memorable co-workers that were positive but honestly I think that's because usually if they're good at what they do I don't have to interact with them a bunch or spend time thinking "Jesus what am I going to have to fix next from this guy". I definitely have worked with good/great programmers, they just don't stand out as much as the shitty ones.