How do you handle your partners child not liking you

I've been dating my boyfriend 10 months. He has a 13 year old and he's autistic. I've tried really hard to bond with him but I honestly feel like he hates me. I know he struggles with emotional regulation which is why he wears headphones so I'm always trying to be considerate of him. I've tried to play with him. He really enjoys Legos. I've sat with him and asked to play and he just ignores me and continues building. I try talking to him and he doesn't always respond. My boyfriend said he just goes nonverbal sometimes and it's not me. Just I just feel like he doesn't like me. He's ignored all my efforts to bomd