Ok - just congratulate yourself that you know so much more than this woman, you're the expert here so whatever she says is not relevant.
I think sometimes people say stuff like this because they are just filling in airtime and it's something to say, and they don't care how stupid it makes them sound. My boss said last week that 'oh you have the really bad diabetes don't you'....... aaarrrrrrrggggghhh.......... Like any type is better than the other, it's down to perception. My boss doesn't know that I manage my diabetes just fine and it's not a life changer, I manage it and it doesn't manage me, hey presto.
There is alot of work to be done in educating the uneducated out there, good luck all