Suburbs are often old small towns with housing built up around; they can have an urban component!
The real deep underlying issue is envy that you can’t live the way you want, and lashing out - combined with our houses lasting way too damn long. Nobody is knocking down 100 year old but serviceable houses unless there’s a HUGE moneymaking demand.
But that’s what you need to cycle housing stock.
The other thing I don't get is the food argument. Do people really eat out all the time? When I travel for work I have weeks where I have to eat out and my body is yelling at me by the time I am back home. It feels like restaurants dump whole salt shakers in their meals.
We also love having a small but well-stocked grocery within walking distance.
I grew up in the suburbs, and while yes, they do vary wildly in density, many will not have these walkable features.