If so, what trigger warnings should one warn against?
Alternatively, I also saw on another post that said that, the trigger warning wasn't actually serious, but a satire
Either way, should I place a trigger warning if making a post discussing Disney, or do I not actually have to?
It depends on the content you want to talk about. A general warning won't help to avoid trigger, stress or anxiety. Better to write your text, read over it, put it in spoilers and prepend content notes (CN) about the included points. These can be various traumatizing aspects and you can be really detailed as people have various stress symptoms. Food, harrassment, bullying, sexism, death - everything you talk about you can warn your readers with content notes.
Is there a good template to use?