I think you're response is hilarious! Seriously funny. No, I have never walked into a restaurant with 7 others and ordered a milkshake in the dining room.
I think you should live in my city and try to understand that everything in our world is not an amusement park. I never once implied that people who order a dessert only are of a lower economic class. When we lived in NJ, we took the kids to Perkins all the time. I think they had a kids eat free deal. So I only related my experience and what is customary in the capital of the United States which if you are aware, is a big tourist destination. I couldn't possibly be so judgmental as to pretend that I know what is done elsewhere. So yes, there are regional differences.
Oh I don't think the world is an amusement park clearly given that the behavior you're

at is something I see around here. Sure we have an amusement park but no one could confuse it for steakhouses lol
I'm not sure what you're meaning about lower economic class. I was meaning my style of living as in going to places for desserts. A nice coffee and cake or cheesecake or piece of pie is a wonderful end to an evening! Or in this case a shake.
Perkins around here had (like I said nearest one is a little away so we don't go much) but it specifically had a deal for $3.99 I believe for a piece of pie and a drink. We'd get coffee (decaf) majority of the time. And it was for after 8 IIRC? Step-father-in-law is not a pie person so he'd get muffins.
By regional I was referring to Cheesecake Factory because no one could legit claim that isn't a restaurant that people go to specifically for dessert. They have an extensive menu for that too...well they should it's in their name
Basically what I'm getting at is it's a rare find indeed that someone in their entire lives has not nor will not on some presumption that it is gauche (which is in a nutshell what you were getting at with your comment about forgetting how to dine) ever never ever go to a restaurant for dessert. Okay you win because I found that rare find
ETA: Just to give a comparison sake for that steakhouse we often go to for dessert. The typical dish I get is either $16 or $19. I often just get water for a drink although every now and then a beer. The dessert I typically get ranges from $8-$11. I believe the coffee is about $4 (I think it's a tad less than that but the menu doesn't list soft drinks or coffee I'm just going by memory, it's more than $3.50 I know that. So on if I order my normal entree I'm not hungry for dessert and if we go there for dessert we're spending pretty close to what we'd spend with just the entree with water. Not exact but close enough. Just for those looking at pricing. By the way this steakhouse isn't a place I'd get steak at but their chicken fried chicken is their most popular dish and used to be a few dollars less.
Now at Longhorn the steak I get is $15.29 for a 6oz which is what I get (it used to be about a dollar less). We are not hungry for dessert especially after you add in the bread beforehand. I usually get water to drink too every now and then a beer. Their chocolate stampede (which if you're eating it just yourself you better do it over two days!) is 10.29. Now if we're there for dessert it's decaf coffee again. And assume roughly the same price as the other steakhouse. And basically you're again close to what I'd be ordering if I did an entree. Not exactly but close.
Just in case people are concerned about the dollar amounts. And as we've seen with WDW this can vary too. It's never a sure thing that a party is ordering dollar amount more than someone in there just for desserts. And FWIW I know with the places we go to (exception Perkins because they are always dead sadly these days) turning over tables faster does help them in the end. A party there for food especially steaks or a place that serves bread, or salad or both ahead of the meal does take up the table more. And with Sci-Fi it's more plausible the family with just the shakes takes up less time in the end.