generalization

There is some conversation going on right now in the forums questioning whether it is appropriate to make generalizations about people with ADHD.  One person suggests this is insulting or hurtful to group those with ADHD together.  Another poster asks:  ‘if "they" (people with ADHD) are all so completely different, why do we keep hearing the same behaviors (forgetting, interrupting, not handling money well, etc.) coming up over and over?’  I would like to respond to this question in the blog, rather than in the forums.