Yes, don't we all hate it when people come into our job and tell us how to do it?
Parents love to think that because they have had one child (or maybe a couple), they know how to educate children writ large. Compounding that, most people went through the education system as students, so they believe they have insider knowledge as to how the system works. Usually their advice on how to fix the system is geared toward fixing the frustrations they personally felt as a student.
In reality, most people are only exposed to the education system as consumers, and therefore know next to nothing about how it actually works. Doesn't stop them from spouting off what they think they know on internet forums and blogs though. They enjoy pointing out what they see as problems, and are happy to offer quick fixes born in ignorance that have either already been tried and don't work, or don't solve the problem for reasons obvious to people currently working on it. Or better yet, the supposed problem isn't one at all, but a boogeyman that politicians are currently pushing to scare voters.
If you want to fix education, get into the mix and actually help. Sitting on the sidelines complaining isn't helping anyone. If your perspective about the education system is along the lines of "people who can't, teach", as seems to be in vogue these days, then you're really part of the problem.