You become a bad sport when you blow up people's personal vehicles and you pay them a certain amount that range from $87 - $12,500. Sometimes if you overdo it, you'll be put into a Bad Sport server and you'll have a cone hat that says, 'bad spot' on it (mess).
It's so stupid because you're still able to shoot people for hours and not considered a 'bad sport', you can just be kicked from that server and moved onto another.
Plus, being a good sport only results in $1,000, though, I think they've bumped that up to $2,000 now.
I think that's the rough outline, anyone feel free to correct me (if anyone even comes here anymore)
It's stupid, it's not like everyone is gonna be saluting you when you walk up to 'em.