"You can only blame brigading so often before it becomes the community doing it. I mean they obviously all have accounts and regularly do this shit "

If a group that talks primarily outside of reddit, and has accounts purely to do actions on reddit, they are not redditors.

"What, you think the Civil Rights Movement should have allowed Nazis to march with them and attack their goals?"

Reddit isn't the civil rights movement. Any subreddit which wishes to push for civil rights is free to ban any sort of discussion or comments they like. Just look at what /r/feminism does. They are a bit too strict with the banning, IMO, but it is often for good reason and keeps the community intact.

" It's not like the Internet is a less free place because racists have to make their own spots"

It means reddit is a less free place, however. And, again, i'd rather see and deal with issues than push them to where they are hidden and I can live in bliss.

"The point of an open Internet is that anyone can make their own community"

Look at the structure of reddit for a moment.

I also read reddit, and again, outside of the context of it being an "offensive joke" or some other sort of comment, nearly anything that is racist quickly gets downvoted.