It's a big Internet - there are plenty of places you can go and air your views. Or you can create your own site. Meanwhile, reddit has apparently decided they are serving the market of people who want to discuss the subject without the interjections of those who disagree.
Freedom of speech is a property right - you have the right to use your own press, your own soapbox, etc. Nobody's obligated to provide one. And some people just want to be left alone in private. If they do, of course, the rest of us are free to point them out just in case anyone wants to avoid that group. Maybe that's all you were doing here.
It is perfectly fine that Reddit bans science deniers. It is a private organization. It is kind of like Fox News banning intelligent and honest people from being guests on their shows. Private companies can do what they want.
It's perfectly fine to hold a book burning party as well, and if a majority of a community desires it it's OK to raid the public library for fuel. Democracy. It's mighty unsightly though.
I am going to stop reading and responding to you right here because I am going to assume that the rest of what you are going to say is based on the same kind of logic that you opened with.
1. It is perfectly fine to have a book burning party if you A) own and lawfully came into possession of said books and B) hold said book burning party on your own private land. The point is, if it is your private land you can do what you want. Reddit has its own little private space in the internet, it can do what it wants.
2. If a majority of a community desires to raid a public library and burn the books it is not okay, it is against the law. Right now the majority of Americans want to make Obama quit, but they don't do it because that would be against the law. Just because the community up and has a desire doesn't mean they get their way. I seem to remember some recent Presidential election in 2000 where the majority of Americans voted for one candidate but instead because of silly lines drawn on a map the other candidate won, yet there was no revolution. That is democracy for you; real democracy, not the silly one you are imagining. It isn't perfect and people don't always get what they want, but usually there isn't wild chaos when a community gets some kind of wild spur desire.