I know how you feel! My oldest started kindergarten Aug. 9, after never having been to a preschool or day care. I thought it was going to be really hard for both of us, but she hopped in her seat and started coloring. DS got upset leaving her there, but I was fine. Go figure.
I was going to go to the "Tissues and Tea" in the cafeteria, but since I wasn't crying I didn't want to see all the other moms upset and start crying myself, so I left and took DS to the grocery store.
Sorry you had to witness that mean ole' daddy being nasty to his son. Poor kid.