Not an excuse, a 15 and 16 year old are perfectly capable of knowing what they are saying is hurtful.
That being said, the guy's reaction was over the top.
BoS is the cream of the crop (excl Ruse), everyone here has high expectations whether or not they achieve them. Don't let it get you down because there are a lot of us here that didn't perform as well as we thought we would (ego's bigger than our heads).