Because of something that some fan did and some of his friends defended him against that was admittedly really awful apparently now means the word "brony" is tainted and if anyone calls themselves that even if they think it's just a fan nickname they're all the sudden "a shitty person". I'm not a big fan of the term anymore but I think that's kind of dumb. Judge someone if they actually say something sexist or something. Not because they use a fan nickname that one awful guy and his friends used.