Many people treat kids like inferior beings, using "cute" voice, not giving them a chance to say their word, make a decision and such. Do you think such behavior might bring harm to the development of their personality, and they should be instead treated like adults, but just less experienced, so with understanding and patience?
When i talk with my child i talk with him like to an adult but, in the same time, i manage the direction of the discussion and he is aware of the limits of the discussion.