Why was " Tourettes John's " total embarassment and humiliation overlooked?

It's called 'reclaiming'. Let's break it down into SUPER, SUPER simple terms. Imagine you are someone born with a certain condition or with a certain characteristic that is not deemed 'normal' by greater society. This characteristic is not entirely rare, but still makes you a minority in the eyes of those who do not have this characteristic. This characteristic is used to taunt, demonise and dehumanise not just you, but everyone else who shares this characteristic with you, and even those who don't share this characteristic but still treats you like a human being is taunted for it too. This goes on for generations. Society even comes up with a whole slew of special new words, phrases and actions all in mockery of this characteristic. You could be gay and they're calling you the f slur. You could be black and they're calling you the n slur. You could be trans and they're calling you the t slur. It could be anything, and the word used to describe you is eventually, thankfully, begun to be recognised as a slur. A very horrible word nobody should use or say. But it doesn't stop a massive amount of people still using it against you. At some point, you decide enough is enough. Why should you be ashamed of this characteristic? You shouldn't. So what do you do? You start using the word about yourself, perhaps with a tweak here and there. Some who share the characteristic may find it an odd form of comfort or fun to use the word about themselves. In a weird way, you guys using it to refer to eachother and yourselves makes the hurt the word causes feel a little less. That's why some gay people call themselves the f slur. That's why some trans people call themselves the t slur. And why some black people may use the n slur. Obviously not everyone of whatever group will be okay with using or hearing the word even if used by people who share the characteristic with them. Of course, the real history is a hell of a lot more complicated than that. But in the hopes that you're not entirely willfully ignorant, I did my best to explain it in simple terms. Words are words, but context is everything otherwise we wouldn't have language or communication. You can't just say anything and expect it to mean anything if you don't give it context.