According to dictionaries, the definition of “Jock” is:
an enthusiast or participant in a specified activity
The example listed was even “a computer jock” 
So…a writer/report or newsreader can still be a jock. 
In fact, you can technically suck at something and still be a “jock” for it if you are a “participant” in it.
So, based on those clarifications, your groups who played dodgeball as jocks, and groups who played dodgeball as non-jocks both were participants in dodgeball, and could both be labeled as “dodgeball jocks” since they were both dodgeball participants. 
So…you can like or dislike jocks, but EVERYBODY is a jock of some kind or another.
Though, colloquially it is often used as a stereotype of an athlete or sports culture vs intellectual pursuits/activities…I still like to play semantics with my old frog buddy when he gives me a good excuse.
Yes, peep, YOU are a jock, and so am I, and so is everyone. What kind of jock you are is another story.
This should’ve been a post in your word of the day thread.