You don't even care what people say.
I do, but not everyone's opinion, or a whole post, holds the same importance. I quote what I'm replying to and what is relevant to what I'm saying. I've been on forums long enough to know that people like to take the looong way and dilute discussions with unnecessary (sometimes exaggerated) comparisons and completely off topic arguments. Brevity's a blessing - scrutinizing every sentence worsens legibility and helps no one's argument. It's filler that'll turn into a quote wars further and further from the point.

I'm focusing on what I'm discussing and leave out what doesn't concern it.