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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 
Software tutorials especially. Even worse are the ones that are screen recorded off a 4K desktop so that unless you're also watching the video at 4K, you're not gonna be able to see where the mouse cursor is because the compression makes it almost invisible.
I wouldn't blame it on the current generation, though. People my own age do this shit too.
I shouldn't complain too much because it's free tech support and they're making these videos for no money , and probably for a program that I pirated.
I'm just baffled by the current generation being able to use video tutorials. I guess it's what they've always had so they're used to it but back in my day we used text and only the occasional picture!
I catch myself rewinding them over and over because steps happen too fast or are not clear enough. Worse so ever since YouTube fucked up the seek bar in the mobile app so it's more difficult to precision seek a video.