Hardly. It's just that there's a standard for quality of argument, which means that a lot of conservative nonsense gets shot down on sight. There are big conflicting "liberal" and "libertarian" factions, a lot of European social democrats, a growing pro-union faction, but also the gun owner faction and (unsurprisingly) a lot of "small business conservatives" and so on.

You can, for example, debate pro-vs-anti nuclear power without necessarily getting downvoted. You can't post straight up climate change denial.

You can argue that the stackexchange moderator fiasco was incredibly badly handled. You can't post straight up homophobia.