I know I'm not the first, but I've been thinking about modern fandom and I feel like some things would be at least partly improved if we brought back some old fandom terms. There's two in particular that I really think we could use again:
Squick - Basically means something you don't want to see in a piece of media, typically fanfiction or other online media. A squick can be upsetting, but it's not the same thing as a trigger. A trigger typically has to do with mental conditions, such as trauma or clinical phobias, whereas a squick just really bothers you.
Canon nazi (I figure this is best written with a lowercase 'n') - You know how people use the terms 'spelling nazis' or 'grammar nazis' to mean people who feel the need to address every mistake you make, and may even try to use it to say they don't need to listen to you? A 'canon nazi' is similar, they get after you for any small or even just potential divergence from canon in your art or fiction. And in recent times, these people will try to tell you you can't ship something if it's not canon or has no canon basis. Or even in the case of something unrelated to ships, I once saw someone make fun of OtGW AUs where Wirt becomes the Beast because it's not canon and he didn't become the Beast. What's the point of fanfiction again? As a whole, I've noticed that fandom has become obsessed with being 'CaNoN-CoMpLiAnT' and will even use minor things in canon or even just writers or actors saying/doing things outside of actively working on the series as evidence of something they like being canon, because they think their ship or headcanon has to be canon for them to be allowed to enjoy it. Or, they may use those small things to say that someone else isn't allowed to have a certain ship or headcanon. This obsession with 'canon compliance' is taking the fun out of fandom, and fandom is supposed to be fun.
Also, as a quick note, I'd be open to an alternative term to 'canon nazi,' maybe 'canon police?'
So yeah, I think modern fandom would benefit from bringing these terms back.