What I know is my situation, and what I see locally.
For me, I never liked any Mustang made after 1973.
The "classics" were all around me growing up, including my father owning some, so that is what floated my boat.
I graduated high school in 87, and saw the rich kids in school driving new(ish) 79-87 Foxes, and that just bolstered my contempt for them.
My first modern V8 EFI car was an LT1/M6 Z-28. I had a choice between the 5.0 Stang and the Z-28, and the Chevy was faster, cheaper, and better equipped as standard, where Ford charged extra for many of the Z's standard features. No brainer. I went through 3 Z-28s, all black, 1 auto, 2 6 speeds, and the last one LS1. Still love them.
Anyway, today, my interest in Fox bodies has come from my now adult sons.
The oldest got a Fox Fairmont, and the other an SN95, and I was the chief mechanic on these 2, along with my EFI F150.
What was contempt turned into appreciation as I worked on these 5.0s and Fox bodies.
When one came for sale recently at a price I couldn't ignore, I finally bought my first Fox after all these years.
An 87... Same year I graduated.
As for 'who owns Foxes' around me, the majority are owned by 'kids' my son's age!
My 20 year old son has several friends with Fox Mustangs!
He also has helped some friends with 'classic' Fords swap in EFI 5.0s... 2 early 60s Falcons.
I would venture a guess that these kids were like myself.
While my father and his friends surrounded me with classic muscle when I was young, these kids were probably raised with their elders having Fox bodies, so that is what they like.
So that leaves you with 2 distinct age groups that love these cars:
The group that saw them new in the showroom when they were 12-20, but couldn't afford one at the time.
Then the group that is now of age, but when they were growing up, say 4-12 years old, their significant elders had these cars and made an impression.