It always saddens me when I hear of adults closing off conversations with children (and in this case in such a dismissive manner). Adults really should realise

It always saddens me when I hear of adults closing off conversations with children (and in this case in such a dismissive manner). Adults really should realise that they are constantly teaching children, or rather, children are constantly learning from them. What did this exchange teach? A better approach is to keep things open - for example, respond with something along the lines of "how do you know?" (or even just "why?"). The you get to talk about seasons and how they relate to temperature and weather, leaves on the trees, snowmen...