Wow! 8 lbs in a week is fantastic - because you've been 'moving more, ' and I'm guess eating less.
However, I can't believe those kids were so damned rude to you. Maybe it was a slap you think you needed. Well, a slap is never a good thing, especially from a stranger. I hope they eventually realize that, and learn some compassion.
You're doing well, at the start of a journey that takes time. Try to enjoy the ride and not think about the slap - think about the future you!