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There're a few things that indicate this is either completely fabricated or at least embellished.
The dialog is unrealistic, unnatural.
The person telling the story is a "hero," putting the other person in their place.
Little detail is given about the other person. They're simply a prop to support the "hero."
There's a strong lesson to the story. It's not just something that happened.
It's ultimately harmless, but likely never happened outside of the mind of the person that wrote it.

First, "The problem with this generation" complaint has existed as long as people and language. The only real difference is there's now a name, Millennials, to focus all the criticism to.
Second, it's not just Millennials that are "The Problem." I'm seeing more and more people my age (late 40's) and older than think they're more important than anyone else, the rules don't apply to them, and everyone better bow down and kiss their precious little asses. It's getting absurd the number of people that feel they can do whatever they like now, and how quickly they fly into a rage when anyone dares to question them. Millennials have their share of unique problems, certainly, but they're not "The Problem" these days.

Yeah, "hard work." This clown was collecting unemployment because he's too lazy to train and hold down a job at the same time; something most young fighters do. He even made it sound like some kind of accomplishment.

He didn't really figure anything out. Dogs aren't smart enough to understand batteries. It simply ran as close to the edge of the property as it could without getting shocked. It doesn't know why the beeping stopped, or even why it started, but the beeping came before the shock and now the beeping stopped, so..

Few people claim they're "dumb," just that they are animals. Project Nim confirmed this theory.