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.
In my research so far I am finding (to my shock and horror) that the 'skeptics' tend to have at least as high quality science and they have a lot more transparency. And a lot more fun, but that's beside the point.
The recent 'secret science' bill which just passed the House is really pretty interesting. The vote was straight-arrow party line. On the face of it I would agree in the strongest possible terms that all science used to implement public policy be open for scientific review. This especially since when it comes to climate 'science', the 'scientists' were caught red-handed doing severe crimes against any conception of science, and there results fed directly into various policy making apparatus. The left wingers had to really reach to find an explanation for why data had to be hidden from the public.
The most interesting thing is that there has been a giant push by the media to push the 'secret science good' paradigm and demonize the right wing for trying to get transparency. Of course the right wing is going to use it to attack the EPA and their policy making methods, but the fact that they could use transparency to do so speaks volumes about the kinds of corruption that is actually going on and that the EPA (and likely many other government bodies) are using as an increasingly necessary crutch.