Isn’t it more having difficulty focusing for extended periods?

According to OP, they can't even make it to the end of a sentence. shrug

I’d say the phenomenon is more hyperfocusing long enough to figure out the point,

and then getting frustrated as the speaker takes a long time to illustrate that point.

I definitely get feeling annoyed when someone rambles. And I get tuning out when a work presentation or a school lecture drags on. And I get feeling frustrated when a conversation or discussion is sidelined by minutiae.

But the "Um, aktuly, I don't need to listen to this because I already know the answer" shit is extremely toxic behavior that inevitably sets people up to fail. If you've ever had to deal with student drivers before, it's the way someone responds moments before they bend a fender.

Getting Overwhelmed is entirely different from Knowing The Answer In Advance.