You never know what some other kid is going through. My dad killed himself when I was in the 3rd grade and my brother died of leukemia 2 yrs later. When I went back to school in the 4th grade I had gained a lot of weight and I can't tell you how harrassed I was until the 10th grade. That does so much more damage to someone already dealing with home issues. My advise would be to apologize. I would absolutely welcome that from my childhood bullies!