FWIW, I regularly expose myself to pretty much exactly the same danger he's choosing to expose himself to - just because the engines I work on in my garage are made by Ducati or Mazda, it doesn't make my sitting down in non-protective clothing with open containers of gasoline and no eye protection noticeably "safer". (In fact my jeans still smell slightly of the gasoline I spilled on them on Saturday…)

I think you'll find a vast number of "grown men" who'd recognise the risks you identify here, and say "Yeah, it's not as safe as sitting on the couch watching TV. Grab a beer and stand back in case this explodes…"

And while you might question their intelligence – they'll just as incorrectly question your manhood for doing so…