I don't think spoiler tags need to be divisive
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It's also kind of annoying that all dreams are relegated into Animal Crossing Bells the sticky thread, so you will find continuous boring/similar picture posts (villager photographs or golden tools are trendy accomplishments, but seeing them happen to somebody else for the 100th time could be a parting ) and much more involved/creative jobs like island-wide quests are hidden in a thread that has little interaction.
If they are an obvious meme/juxtaposition like Bernie sitting in your plaza, but should you photoshop on wings to your outfit, put a hopeless thing on a desk, or change the color of a non-customizable thing it should be flagged so people won't be disappointed when they can't replicate it in-game.
I don't think spoiler tags need to be divisive. Right now it will become an issue because there are no clear rules about what is expected and acceptable in the sub.
If the principles were clear (ie: spoiler tags necessary for Animal Crossing Items For Sale events that have not occurred in real time or spoiler tags necessary for articles that contain items that have been attained via hacking to bypass timelocking) perhaps users wouldn't take it as a personal attack in their play mode when people asked they use a spoiler tag.