Calling reddit worse is silly. It gets about 20 million unique visitors a month, a lot of which are American. At that point its more of a realistic sample of everyday people, who just happen to be shielded by anonymity. Point being, ya there are going to be racists but there are going to be a lot more of other people too also there are going to people who just say shit to troll people because its an online forum.
For example I find r/canada pretty damn racist when it comes to stories about natives, however the opinions stated there that I dislike are not something you wouldn't over hear just walking down the street in saskatoon.
Now obviously there are racist subreddits. My favorite being r/blackfathers which use to go to empty subreddit page that said 'There doesn't seem to be anything here' until reddit quarantined it last year.
http://imgur.com/gallery/JomAvkm