Well we'll stay friends and agree to differ. Pointing out that to most people visiting Epcot that the price doesn't matter isn't trying to shut down an opinion anymore than you saying it does matter is trying to do so. It's just a different opinion.
The attraction was built to satisfy paying guests and to get them in the park, like that or not that's true. These are the people that Disney are trying to entertain, engage or call it whatever. Saying to a group of people on the internet who mostly don't go to Epcot that "in my opinion it doesn't matter what it cost because those who measure enjoyment like that are unlikely to be paying guests" (or however he worded it, you get the gist) is addressing the fact that most won't factor that in. That's not shutting down your argument (unless you're conceding you have no counter argument) but is a valid factor to the point he's making. Again the fact that you don't like this point doesn't make it invalid, he's saying it because it's true. The vast majority of the people who pay and ride this attraction won't factor in the cost, most won't have a clue.
I know saying that may seem like it's taking some of your argument away, but he's backing up his point by saying that. If it wasn't true then you'd have more of a point. I get your point of view, I honestly do. However it's only really valid from the perspective of those who are on your side and wanting to discuss the ride on that basis alone.
But let's leave it now, I see both sides but think there's more validity on one than the other (just as you do). I don't think he's dismissing your view but rather pointing out that to paying visitors it's not really important. That's not the entire argument I know, but it is a large demographic of the more relevant factor and I believe he's emphasising that point rather than shutting you down.
Anyhow next time I visit Epcot in October 2023 we can meet up and ride it together. I'll even buy you an ice cream ($10 by then) and then we can laugh and discuss the attraction, or have a fight in the car park (I'm hoping for the former)