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Old farts of Hexbear, is there something about younger people that you don't get? [no punching down!]
(hexbear.net)
OK this is my list. But first, I need to say that this isn't a condemnation of those into such thing. They just don't vibe with me.
- Cannot get into ASMR. I've tried. Often its women 20 years younger than me, rubbing their fingernails on hairbrushes. The intentional sounds they make with their lips and fingers are things that would make me want to change seats on a bus.
- Instagram. I was maybe the last person to get a smart phone. It was probably 2016. I'm just fully lazy to take photos of stuff. This is a real issue when I'm single and I need to start putting photos on dating sites, as all pics of me in my phone are me squeezing carrots in my nostrils and similarly goofy things.
- My students' taste in anime. I try to be all cool and show off my cool taste in anime, maybe drop a Azumanga Daioh clip. It's all ancient history for 17 year olds.
- Photo and videos done in portrait mode. I guess I don't watch videos on the go. See #2
Things that the kids these days do better:
- Usually better opinions on current events than people my age
- I wish that cosplay existed when I was a teen. The default when I was younger was drugs.
If anyone insults the kids, I will visit you at your home and do an 
Listening to people younger than yourself also keeps you grounded in the present. Too many people get stuck in the past, or get isolated from wider society. I really don't want to become a detached old person, that's one of my greatest fear. I don't ever want to have the feeling that time has passed me by and I'll never understand the world.
I haven't had that feeling so far, thankfully. You're right about younger people needing mentors and stuff, I hadn't seen it much from that angle. I think older people need to listen to younger folk as well, to keep them grounded in reality. Younger people aren't aliens out to ruin society and they're not naive confused toddlers either. They're people sharing the present and we don't need to have such a generational gulf or apprehension if we're all on Earth and alive at the same time.
Word. Ideally mentoring would be listening to problems kids are having and offering your experience and knowledge as a resource they can use to find solutions for those problems, rather than trying to tell them what to do with your withered Millenial brain.