He brings his adult son to all of our dates

So, I'm 27F, dating a 40M, with a 19M son. We’ve been dating for like 5 months. He spent like 10 years in prison, & this missed a lot of his son's childhood. As such, he quickly started bringing his son on dates. I figured, ok fine. We're seeing a comedy show, that's kinda cool, whatever. However, after that he never asked. I would ask for dates, he would eventually oblige, but his son would just... get in the car with us. To the zoo. To the spa. To the movies. To everything we did. And often, his input changed the course of the date.
Plan? Go to the zoo & eat at this nice diner.
Outcome? His son comes without warning, We're late be his son wanted chipotle, we go to the zoo, his son is late to work so he spends the whole day with us, etc.
This has happened multiple times. His son went back to college, so it's different, but now, j don't even get dates. It's "hey, wanna drive a 6 hour round trip to see my son's football game tomorrow?"
I eventually brought it up to him and he went nuclear. Saying I expected special treatment, was asking for special treatment, etc. I tried explaining that he can have multiple relationships and maintain them seperate ly with occasional time together (we all often go to the gym together). And I don't mind him coming along SOMETIMES. I would just like SOMETHING that isn't HIM focused. Some intentional couple time. He said "you don't get it" and says i don't respect his son.
What do I do?