Do You Assume Most People Follow Sports?

Earlier this evening I was at a friends house and there was a toy or some shite that kept making this annoying sound. There was this piece of pipe in my friend's shop, where we were, up against the wall and I grabbed it and said.. "pitch it, I am about to Barry Bonds this mother fricker" and my friend laughed (it wasn't meant to be a joke, I just said it bullshitting around with no intent to be funny) and this guy, my friend had over, who I met for the first time today was there. And he said "you are going to do what?", I guess not understanding what I said.. And I said "I was going to hit it" and he asked "yeah, but what did you say instead of hit it?" and I told him I said I was going to Barry Bonds it. He kinda laughed and asked "what does that mean?" and my friend was like "Barry Bonds.. the dude with the most homeruns in a season" and the guy said "Oh. He is a baseball player? I don't follow sports".

I know there are people who doesn't follow sports as much as others and some people who don't really follow it, but are at least aware of the big stories.. But how common is it for someone to know absolutely nothing about sports?