I run into this sometimes because I have a job that requires a "public face." People assume a lot, particularly that if they have heard of me and have access to me on social media, we're close friends in "real life." I'll state that I'm having an event in a particular city and they'll say, "Oh, you can come stay with me!" or "Let's meet for drinks!" Or I have people who want to meet for coffee and chat about their work projects.
I don't want to be rude, but really, I DON'T KNOW YOU. Why would I meet you if my only knowledge of you comes from you liking photos on my Facebook page? For my own safety, I politely, but firmly say no. I don't give reasons, which gives them a chance to argue or push against my logic, just a "That won't be possible, but thanks."
The fact that this guy pushed so hard and then immediately started negging with "Oh, you thought i was interested in YOU" to try to knock the OP off balance about her perceptions, tells me he's not a good guy. You're telling me a reasonable adult man can't find a running partner without hounding a complete stranger online? Block him and be done.