Why do people now days correlate being different/quirky to being neurodivergent?

Like now it’s always “I have autism. That’s why I never had many friends.” Or they claim autism because they do quirky things when most people do quirky things but not everyone is autistic or on the spectrum. I have seen people diagnosing themselves on social media and excusing/justifying it with “If you ever think you are autistic then you are.” Forget about the fact that most of us claim things without full understanding and knowledge of it and a lot of people over think. Overthinking makes you come to wrong conclusions every time.

Why do people now days correlate being different/quirky to being neurodivergent?
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