This time is was “healthy morning start!” or some such nonsense. I said “fuck off.”
Next time some prize jerk makes a comment on my running I think I’ll stop. Here’s what I’ll say:
You don’t make comments to men running. I know you don’t so don’t pretend.
Just shut up. Keep your eyes in your head and your tongue inside your lips.
No noises. Shut up or drop dead.
mrsmorleystea 
I think I want to practice saying this in front of the mirror until I can snap this out automatically. Damn.