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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.”
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.