I don't know, but one of the most consistent patterns I've seen with chud posters, the kind that have just about zero post history in a place they get chuddy in until they post their chuddery, is tons and tons of nfl/nba or team specific fansubs.
My hypothesis is "social engineers" and freelance chuds build up karma points by nodding along in sports subs then go to /r/antiwork or /r/fuckcars to do one off bootlicking posts. It's weird but otherwise I don't understand the pattern.
I don't spend a lot of time there, but /r/nfl is a mixed bag. They're generally pretty good about stuff like supporting the players when they conflict with the owners, safety issues, NCAA corruption, etc. and overtly chuddy stuff tends to get downvoted, but there's a lot of unexamined racism and classism that seeps into a lot of the posts there.