You are correct sir.
I'll be sure to throw you a couple of bucks when you get sick and lose everything and become homeless. Just make sure you have a witty cardboard sign. I like those.
He can't be a positive role model to black kids because he's not black*. He can't be a role model to disabled kids because he's not disabled*. He's doing what he can to help in one specific usecase. His efforts should be appreciated by everybody.
*I acknowledge you shouldn't be excluded from being a role model if you don't share the same skin colour or able-bodiness. But if you share those attributes I presume it creates a closer connection.