Step son constantly bullied over his eyes

My step son has heterochromia. He has one blue eye and one brown eye. He hates himself because he gets bullied about it a lot. He's 14 and I already know puberty is hard and middle schoolers are dicks. He came home today from day camp at the YMCA and was crying asking where his eyes ugly and was he ugly. I said of course not. So did his dad. He called us liars and went to cry in his bedroom. He has convinced himself that he's weird and his eyes are ugly and he's ugly.... Poor boy. And he's so sweet too. He is always helping with his new Baby sister and hes a very huggy person amd loves giving me a hug. And giving everyone love.... I hate seeing him hurt.

Edit: I showed my step son these comments and they made him cry again. But happy crying. Kids are asshole but thx for helping him feel better.