As for people talking too much? I think the opposite (people not communicationg enough) is the real problem,
I meant people TALK too much. I didn't say they communicate too much. You don't have to talk to communicate, and you can talk without communicating (i.e. bullshit smalltalk).
And if people don't talk enough, they don't communicate enough. Similarly, if people don't state their intentions sufficiently enough through talk or through writing, as in your "In my opinion" example, then the methods of communication are limited, especially if the forms of communication are limited to one modality (talk, or text, for example), and so the results are less satisfying.
You can communicate without talking, but can you interpret it just as well if you are restricted to the one form of communication (such as an internet message board)? And you can talk (or write) without communicating, but then again you just have to be good at listening (or reading, respectively) to filter out what is of value to you.
This has been an interesting conversation, and not just because of the ideas being thrown about. It has made me believe that the so-called "stupid" things people say may well just be a result of people trying to clarify things better for their own understanding.
What is "stupid" is the way that the statements can contradict themselves, confound logic and what is deemed common sense, and sometimes with a degree of irony to them, making them humorous.
Also what makes some people think the statements stupid is in how they contradict their own world views - perhaps a better term than "stupid" is "ideologically antagonistic" in these cases.
Some of the shorter phrases deemed "stupid" (or, better, "unwise") are also those seen in hindsight and based on experience of the interpreter. To use my examples earlier in the thread, it would be unwise to tell an angry person to "calm down" as it might be misinterpreted in a paternalistic tone and make them angrier; or to tell someone straight away that you love them is a big risk as it could be seen as a step too far in a budding relationship.
Ultimately, amusing and infuriating these things may be, the stupid things we say all improve communication and understanding, and indeed might end up as being the very necessary things we need to ensure that communication is crystal clear.
During our training, we were always taught that it is better to ask stupid questions early before you ask them too late. And if you do dare to say the stupid thing, you might even find that they might not be so stupid after all.