Not quite. There are 30+ kids in each class. No technique is perfect, and you need to look at the whole situation to make that kind of determination.
If I scare a kid by asking them to speak, for example, and they drop the class, that's not a teaching issue unless [insert lengthy backstory here].
But the entire meme is that point. The teacher needs to ensure the dumb shy kid so they can come out of their shell, grow and become a functional adult. The kid killing school isn't going to need as much of a hand.
Nah, because there are countless students that "quit because the teacher didn't teach how I wanted them to" which usually means "I couldn't just do fuckall and pass".
Yeah, it means everything. Learning is work. Teachers aren't there to put up a shitty movie and scroll on their phone. Yet countless people complain that their teachers taught them because they didn't like the work. This guy was a prime example of that - hige results but gave up because they had to work at it.
The results are the knowledge of a subject. Plenty of people say "oh the teacher sucked that's why I'm so bad at X" when it's purely on the student not willing to work at it.