It's hard to give examples because any example that I give could be explained away by alternate explanations. But as someone who posts a lot on here, it does feel like going against the dominant narrative, even jokingly will get you down voted. Like, for example, if I said that I believed in a smaller government, it doesn't really matter what reasoning I have behind it because that's a conservative POV.

Personally I'm a Democrat and I also try not to let down votes stop me from expressing my own opinions. But there are certain viewpoints (that are not bigoted) that are extremely unpopular here.

I don't think giving a list of examples will convince you otherwise; in my experience people are more likely to just argue about the examples in order to resist the point.