Problem is, even if they are capable of explaining it, it's basically our job to learn things 8 hours a day. Trying to catch someone up on that, who doesn't have that same job, that's nearly impossible. Well, and you still want to rant/tell about your day for social interaction purposes.

Like, my mum would also sometimes ask what my (programmer) workday was like and I'd start telling that we had to deploy onto a really old Linux system. Wait hang on, Linux is an operating system. And an operating system is the software that makes computers go. Do you know what "software" is? Hmm, it's like....
...And yeah, basically one computer science lecture later, I still haven't told anything about my workday.

Sometimes, I can try to leave out such words, like "we had to roll out our software onto a really old computer", but then I can practically only say "that was really annoying". To actually explain how I slayed the beast, I do need to explain the scene.