I kinda get it, guy seems like he was having problems with his community and city as to where his property line was. Seems like pent up anger from a lot of interactions. But the “stay off my lawn!” mentality does little to improve your blood pressure, as shown by his border-line trembling in that video. Hiker is kind of dumb for dropping the “i’m a veteran” line.
I rode the Hawes loop trails roughly 2 years ago when I was in Mesa visiting family. Chatting with some locals in the Walgreens parking lot (where a lot of the trail users park to access the trails) I was warned to stick to the marked trail while riding adjacent to some properties along the access route to the main trails. Now I know why I was warned about not doing something so obvious.