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.
There are ideas that don’t deserve a platform (like literal Nazis) and then there are ideas that are not allowed on here because disagreement itself unacceptable. To give a non-politial example, imagine someone who made a post explaining why they like Windows better than Linux. That’s one out of many opinions that are simply not allowed on here.
Lemmy is an echo chamber too. Pro-Linux, anti-Google, pro-Socialism, anti-conservative. I’m still here because I happen to agree with the echo chamber, but let’s not pretend that a diversity of ideas are allowed equal say on this platform.