I believe every one of those words was at one time used in a professional medical context (your "original intent"), to mean a specific thing. Over time they were all co-opted by laymen (us) as insults. Anal-retentive is another such term that's been co-opted, although I think it's still in current medical use.
Words are subject to fashion, just like clothes. 100 years ago Hillary was a male name, now it's more commonly a female name (in the US anyway).
"Where do we draw the line with allowing words to be used outside of their initial purpose?"
You can't. People are going to do whatever they want.
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I believe every one of those words was at one time used in a professional medical context (your "original intent"), to mean a specific thing. Over time they were all co-opted by laymen (us) as insults. Anal-retentive is another such term that's been co-opted, although I think it's still in current medical use.
Words are subject to fashion, just like clothes. 100 years ago Hillary was a male name, now it's more commonly a female name (in the US anyway).
"Where do we draw the line with allowing words to be used outside of their initial purpose?"
You can't. People are going to do whatever they want.
"Anal-retentive is another such term that's been co-opted, although I think it's still in current medical use."
It's a Freudian term, so to whatever extent it's still in clinical use, it's barely even in use. There are few Freudians left.