One of the big differences is that being the guy who gets woken up at 3am is for the young people in tech but in the blue collar industries its for the guys who have stuck it out past 40 and are really experienced.
Side projects are just as common in the blue collar world but they're used as less of a technical filter and more of a culture fit filter.
Absolutely, if you're the one person in a group who doesn't want to go hunting on the weekend or doesn't care about working on and accessorizing your pickup, you may not really fit in. (Just picking a couple of random stereotypical behaviors that have certainly existed with people I've worked with.)
Nobody cares what you don't do so long as you're not loud and obnoxious about being superior to people who do whatever that thing is.