I personally think if you feel THAT strongly about certain fandom groups "interacting" with your posts online, it's on YOU to block and also: you should put it in your username or AT LEAST on this site, and not require people to go to your profile and then click through a carrd
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Their DNI: a link hidden in the location field of their twt bio, carrd with 5 pt light pink font on dark pink bg, a list that you have to scroll, and then it just says "freaks/weirdos dni"