You know what's worse?
When they click once on a folder that requires them to click twice.
And then they sit there.
"It's not coming up.
"Why isn't it coming up."
"I guess it just takes a while to load."
*Stares at the screen silently waiting for the folder to open*
And, naturally, as you're watching them do this, noticing it every single time, you go to open your mouth and tell them that they need to double click, you remember that this is somewhere around the 50th time doing so and that you should no longer bother and just let them figure it out by themselves.
"Stupid computer shit not working."