I dropped ds at preschool this morning. His friend who we had gone on a day trip the day before said as we walked in- your not myk best friend. My dS visibly crumbled. I said something like thats not a kind way to start the day, room leader came over and dealt with it well, I tried to comfort ds without making too big a deal. I was actually really upset and tried My best not to show it. How should we deal with this at home, to help ds be more resilient to this kind of thing and teach him not to do it himself?