This hardly matters when that content makes the front page of the site and is given positive votes continually. Every time someone complains about the offensive content in a "default" subreddit, the refrain goes like this: "That's just because it's a default man. You gotta unsub from the defaults and pick your own."
Let's consider that for a minute. The standard view of your website, the view that is presented to any new member, is so clogged with terrible content that the active members recommend you change it immediately.
When we buy phones and computers like this, we call it bloatware; we nuke the entire filesystem and start over. But when it's actual people generating content that most agree is worthless and often offensive: "well that's just a minority of a minority." Nonsense.