Do you even remember the context in which that was brought up? I don't think you do. So it's time for a magical journey back into the past of things you actually professed!
Hillary coughing was bad because it meant she was sick and weak. As an example, I'll send you back to your homeboy, "Zyklon" Ben Garrison (He lost the right to object to that particular name when he started using the same people who edited his stuff as his main audience and source of income):
http://grrrgraphics.com/cartoonblog/humpty-hillary
http://grrrgraphics.com/cartoonblog/humpty-hillary
This is just a representative sample, there's some primo stuff where he draws her with a diaper and other stuff that's probably better examples, but this'll do fine.
To quote his editorial:
Humpty Hillary has had a great fall. Many of them. She passed out and got a concussion that resulted in a blood clot and many other health issues.(Seizures? Parkinson’s? dementia?) She’s also falling in the polls. She has obvious health problems that she is unable to keep hidden.
...
She’s an ill criminal who is unfit for the presidency.
As her allies try to keep her together, she is falling apart before our eyes.
It wasn't about the coughing, it was about the narrative that she was incredibly sick and medically unfit. Boy, you lot sure forgot that she was sick and going to die when she
didn't. But goddamn if you aren't still going to use it as a smug shibboleth.