Completely right. But we should not lose the ability to appreciate and share our understanding about things that we consider remarkable. At the end, unless we have scientific evidence about something, everything else are opinions. And sadly, although there are several studies, none can be considered conclusive. Plus, there is also the problem that there is almost no research on the field of practical computer engineering. I believe that it is so close to psychology and economy, that it escapes from the "traditional" vision that computer science is an engineering for most of the "traditional" researchers.

About the line, that is literally relative. Our brain adapts to the stimuli that it receives. So, the more polite we are, and the more correct we are, the more ways we have to be transgressor or offending (I just remember uncountable jokes about refined people getting upset about the most human things). And just the opposite is also true.

But something that is right, is that parents do not teach their children with the right values. Not parents, not teachers, neither the society. Although we are tired to say we cannot take anything as true on the Internet, we do not apply that in our everyday lives.

And of course, we need to teach and be more critical. When we read something, we need first to set the context. We cannot demand for the full context in each article, we will not read a full brain dump as preamble for each post, so we must do an extra work to try to understand the surrounding context. For example, when I say that it is brilliant, it is inside the given context. Maybe it is not for you, perhaps it is not for other people, but although you have a different opinion, these words may have something valuable within. And who knows, perhaps you learn something that uncracks your knowledge about TDD. But we cannot dismiss something just because it does not resonate with us. If we do that, we are failing to learn new things, and to understand other people.