My adult boyfriend has inappropriate behaviour and comments and my family think he’s “too much”

My boyfriend is 22 (im 24). He’s great to me and he’s lovely. But I believe he is ADHD and on the autistic spectrum. When he’s with my family they think he’s “too much” or “annoying” because he talks a lot, and can’t sit still and makes comments which people think are inappropriate. He will bully grown men about football which he thinks is a joke but others don’t like it. He stands up and follows people to the toilet and has no awareness of personal space. He also has a very serious issue with drinking alcohol as he gets way too drunk and gets himself on trouble. I’m at a loss because my family think I should end the relationship because they don’t like him. I don’t know how to tell him he needs help or a diagnosis from a GP. Is anyone else struggling with a similar situation?