What's funny -- if indeed it's what happened -- is the idea that a girl would have "must be a baseball fan" as an entry in her checklist for Mr Right, and that she would take seriously his joke about being an exclusive ping-pong fan.
I really didn't pay attention to the ping pong part. I can totally see if you had a real passion for something, like baseball, that could be one of your criteria for someone to spend a significant about of time with.
Me? If I found out someone was anything more than the most casual sports observer, I wouldn't want to start a relationship with them. We would just be too far apart in our general interests and outlook as to how to spend time.
If someone didn't want to see me because they were an avid baseball, or whatever, fan, and I wasn't, I'd be good with that. It means the other person has good insight as to the type of person they want to spend time with.
If I went on a date with someone, and they spent a lot of time talking about religion, or sports, or children, or music, and I saw that as a significant amount of who the person was, I'm sure it would be our last date.
Frankly, I don't think enough people know what they are looking for as a partner or just someone to spend time with, and just sort of put it under the heading of "someone nice"