Sorry that I gave my opinion and that has made you unhappy.

I hate to be the person to break it to you, but you're the cunt in this scenario. Not OP.

When you said

Sorry that I gave my opinion and that has made you unhappy.

You are the one who went out of your way to be a cunt. Not her(I'm assuming her from post history) for asking how you know. What she said sounded like a legitimate question. I'd want to know where someone got their advice as well if they don't have first hand experience. Did you hear it from a veteran runner? A doctor? Dr Oz on The View? We have no way of knowing if you don't clarify, which you didn't. You then lashed out with the passive-aggressive comments.

You are the cunt in this. Also it's really sad you couldn't just let this go. I feel bad for you if you hold grudges that hard.