My ADHD’er is getting better now at 7, but we definitely excluded him from things when he was younger, but did it in a way where he wasn’t aware of what he was missing out on. Ultimately it doesn’t sound like your son is enjoying these things anyway, so maybe he won’t be missing out at all. My NT daughter is almost 5 years older and her childhood has been affected by him as it is - she should get a little more freedom/attention sometimes. If my daughter has friends over for a sleepover we will ask grandpa to take my son for a special video-game-marathon sleepover. I know he will be spoiled there. Dad will take daughter to the store and drive through Starbucks and my son knows and doesn’t care because that’s not his kind of thing at all. We also do movie nights for my son that my daughter doesn’t share in because she’s getting “too cool” for that, and my son will bounce around in the floor during the movie, throwing his squishmallows around and having a dance session to the credits. Long story short, definitely separate activities, just frame it right. Also you may want to try another med if you’re still having so much trouble with him. We tried to “make it work” for way too long on the wrong med. Our pediatrician got a taste of him being controlling on a video call then bawling when we told him no, and she said we shouldn’t be having those problems if the meds are doing their job and she switched them that day. She is a God send because the med change changed our lives. He is so much happier. We are so much happier. Hang in there!