[underwater]

That is very true. Most of what I say is phrasing or idioms I've unconciously absorbed. However I obviously don't randomly repeat anything I hear. The things that I absorb are ideas that resonate with my existing world view, which has been crafted by original thought over a much longer time. So behind those memes and tired phrasing in the arguments you heard there is porbably a kernel of unique thought.

This is why I prefer online forums and other forms of asynchronous communication over face to face debates. The former allows me to form an opinion - which can often change as I try to articulate myself. The later relies on my initial reaction, which is always much less refined.