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Some miserable people are just miserable, it's not always mental health issues.
Miserable people aren't always miserable because of mental illness. >

But of you ridicule them you will make sure they get there, mentally ill >

Miserable people are not people feeling miserable. They are bad people treating to make others feel bad. 
It’s like how a sad individual is a term you use for someone that’s pathetic or cruel. And not to refer to someone that is feeling sad >

This may be a language thing, but I think that’s not what miserable means >

It’s about how it is used. I’m also not a native speaker if that’s what you mean >

I agree with this entirely. >

I think that saying is less “All miserable people want to drag you down.” and more “Anyone who wants to drag you down is miserable.”