Overreacting ??

So my son has a vision issue. we seen several doctors because of it, they all tell me the same thing - “this eye condition is linked to autism so there is a chance your child will be on the spectrum.” Well my son has been doing a lot of “stemming” things. (Ex. Hitting his head off the wall multiple times, biting himself, choking/gagging himself, smacking himself, etc.) I brought it up to his pediatrician and they said for his age range that it is completely normal!! The pediatrician also referred to the actions as stemming. So when people ask why my son does things I tell them it is because he is stemming. He has a lot of sensory issues as well so I’m obviously going to tell someone (friends, family) that is trying to handle him that he doesn’t like a lot of things because of the sensory issue. Well my boyfriend (not child’s father) told me that I should stop bringing up my sons stemming actions and sensory issues when talking to people. Honestly I’m upset that he would even say that. He said that everything my son does I say it’s him stemming which is not true but the self inflicted actions really are stemming and I rather be open about what my child does than to make people seem like they have to walk on eggshells about questions they have about my son. Sorry this is all over the place, but I have a right to be frustrated about my boyfriends comments on the whole situation, right? Or am I just being crazy?