@WashedOutGundamPilot That sounds a lot like moralizing something that mostly an issue with genetics. For this guy, I would not be suprised if his paternal grandmother was short, and he got a recessive short gene from his dad and a short gene from his mom, making him get a bad stat roll for his height. Sucks, but it can happen.
And his mom is full of shit, even if she is trying to spare his feelings. But perhaps it is her own shallowness coming to bite her in the form of a short son.