Most people need jobs to live, or at least to live well. So they’ll have to contribute to society whether they want to or not.
And if it’s a humid 98 degree day in Washington DC, I’m gonna wear as little as possible, especially if I have the day off.
Well, I’m short but you can always get pants hemmed. Some catalogs (e.g. Land’s End) will do it for you at no charge. I wear cargo shorts in the summer because they’re comfortable and I’m not wearing a coat so I have no other place to put all my stuff. If someone wants to critique my fashion choices, I guess I’d consider that mildly juvenile.
Fortunately I work in the computer field and society gives me a dispensation on fashion because apparently I’m not supposed to know any better 
I consider being bothered by swear words (not being sworn at, just that you’re hearing them at all) to be extremely childish. Which I recognize is incongruence because ancient people seem to be the ones most often bothered.
You grew up in the Midwest and never heard of tater tot casserole? Mine skips the cheese and adds sliced onions or better yet pearl onions. I prefer green beans for the veggie while my wife goes with corn.
Brought Peace?
This is what I came to say.
Posting photos of their lunch on Facebook.
Well to be fair some of those things did not exist when some people were kids. My mom did a lot of sewing when she was a kid because there wasn’t much else to do for fun by herself. She still sews today as a hobby.
I had video games to occupy myself with. I still play today. Most adults, around my age, I know still play and now they play with their 20 year old kids.
I’m 61, and I wear short pants exclusively. I live in Arizona, so I have an excuse. And I’m not alone. Sure, I’ll wear long pants where short pants are inappropriate, but there are very few places where they are. And I don’t care how other people think I look in them. If you think I look like a child, fine. Like John Mellencamp said, “Well, growing up leads to growing old, and then to dying, ooh and dying to me don’t sound like all that much fun.”
If you had a fixed bridge for your front teeth strapped together in the back with that band of metal, you’d want a straw, too. The steel or whatever it is conducts that icy coldness right to the nerves. Similar to brain freeze, only it’s your two front teeth. Eek!
I think there is some kind of inverse relationship between how inefficient an eating method is and how polite it is. For instance, it’s “impolite” to eat food with your fingers even if that results in less food waste, and as a child I used to be lectured about how important it was to tilt my bowl away from me while using a spoon to eat soup from a bowl, rather than towards me, even though it was far easier to eat soup with the latter method than the former. And here someone’s wife is mad because her husband uses a spoon for a casserole rather than a fork.
It does seem to be a case of “If a method is more energy-intensive, it’s probably politer” etiquette.
When I was a kid, the big thing for women was soap operas. My mother planned her life around “As The World Turns.” :smack:
For that matter, I liked “Downton Abbey” but it’s not like I lived for it or anything.
A quote from Doctor Who (Tom Baker).
‘What’s the point of being grown up, if you can’t act childishly when you want to?’
‘Have a jelly baby’.
I think I would have been about 15-16 when I saw that. Liked it then - still do.
Pretty sure that’s just because it’s harder to spill soup all over your lap if you tilt the bowl away. That’s one of the few dining rules that actually makes sense to me, even if it does feel a bit more awkward.
Any decibel-based acts by aging adolescents to draw attention to themselves seem juvenile to me.
The comical redneck in his preposterously lifted and loud pickup truck? The laughable child in his Make-Believe-I’m-a-Dangerous-Felon costume revving his Harley to ear-splitting levels at the stop light? These are the antics of attention seeking children.
They each think they’re presenting the steely-eyed gaze of a dangerous road warrior. All I see is the self-satisfied look of a toddler on a pot.
All of the shorts haters should also steer clear of Australia. Blokes here can get around in them all year round. 
As for the question, no, there really isn’t anything I’d consider juvenile - whatever floats your boat as far as I’m concerned.
Maybe someone who carries on like a toddler if something goes wrong with their order or service in a cafe.
Superhero movies and shows. I’m always amazed when an adult will start talking about the latest superhero movie or tv show. I realize that puts me in the minority here.
ETA: and being a picky eater to the point it affects how/where other people dine.
Video games
Overuse of social media
Picky eating
Making a big deal out of birthdays
Seconded.
You know how much shorter (and cheaper!) taking the kids to Disney World would be if you didn’t have to wait in line behind thousands of freaking adults who won’t grow the fuck up!? :dubious:
In my time as a store cashier, I have seen supposed adults come to fisticuffs over who is going to pay the bill.