reddit has an intense bro-libertarian culture of being super hands-off until it infringes on your ability to talk about video games or whatever
mods of subreddits (who are not employed by reddit itself, unlike the site-wide admins) in my experience are way more concerned with what they consider spam-ish or irrelevant content than enforcing any sort of don't-be-a-bigot policy. i see racism on the league of legends subreddit on a daily basis and nothing ever gets done about it, but recently there was some bullshit about the mods not wanting net neutrality being discussed because most of them deemed it not sufficiently relevant to the subject of a fucking esport
*ahem*
perhaps it just comes with the territory, being a website overwhelmingly consisting of north american white males ages 15-30 with nerdy interests. granted ERA kinda fits that description too, but the difference is the management here gives a shit about rooting out casual racism and whatnot.