>Recently there have been some pretty clear racist undertones running throughout the site (anti-Muslim, in particular)
This is a good example. You'll probably find as many anti-Israel comments as anti-Muslim.
I'm not saying that's a good thing. But it is a scale that balances in the end. One thing that keeps it interesting is that the reddit community doesn't seem to have run for the middle as part of its groupthink, instead it runs for stark polarity.