Hhmmm... I’d use the term “disgusting”. Possibly even “despicable”.
It’s one thing if the kid is playing Ricky Rambo and running through his neighbors properties. Doesn’t sound like the case. He’s providing an armed Neighborhood Watch and folks should take his example as a good thing. Coordinate efforts with local law enforcement, etc...
This is what the Founders had in mind for we the Citizens in the unorganized “militia”.
Also, sporting a plate carrier isn’t exactly “body armor”. The armor part would be what was in the carrier. From the one photo, it doesn’t look “thick” enough for it to have plates.
Thing is, it only takes one instance of Ricky Rambo...the first, because if he had been Ramboing once, he wouldn’t be doing it a second time. Rarely does anyone shoot up a whole bunch of people or Rambo, multiple times.