I will try to keep this short if possible
I am probably overreacting because of my depression/anxiety, but my tummy is still in knots. 
Earlier today, after DS finished school, I took him to his swimming lesson.
Once I got there and DS was in the pool, I walked round to the waiting area where we all watch our DC swim. Whilst in there, two children around 8? started shouting things like -
"look at that fat lady, oh my god shes such a fat lady." infront of absolutely everyone in the room. (about 30 people) I was in complete shock. I gained a few stone over the past couple of years, but I am not huge.
I felt completely humiliated. I know children say silly things, especially in front of their friends, but I think my main issue (after thinking it over) was the fact that the childrens mother didn't say a single thing. She never asked them to stop.
I feel absolutely ridiculous even posting this, because I allowed something an 8 year old child said to me, get to me. I just can't shake how awful I now feel. I just want to bury my head. I know for certain my DS would never shout out at someone like these other children did, which is why I also felt shocked.
Please tell me I am being silly.