Earlier quoted context omitted.
Here's a test; find a six year old, get the six year old to look for stuff on the web. See how confused they are when the search box jumps to the url bar. See how they react to the clickbait and ads that get in the way of every interaction that they have. See how they struggle with dozens of peoples ideas about page layouts and responsiveness. Now, you will say : kids are good at using tech, look they are on x,y & z.…
I believe that "kids these days are good with technology" is a phrase uttered by older people who are actually seeing the kids' willingness to experiment without fear, and assume that it must mean proficiency. Not quite the same thing in the end, though.
For all intents and purposes, it is. I do not know a single person who I would term "proficient with technology" who is afraid of experimenting or overly concerned about making mistakes when using something new.
In my experience, people who are "good with technology" are always curious hackers and tinkerers who are unafraid of breaking things, and are never satisfied with simply using the tool: they must look under the hood and they must understand how it works.
I would say the same principle applies far beyond computer technology: math, engineering, physics, music, etc...