In my experience comparing to the alien site, the average Lemmy server is more tolerant of hot takes and conservatism in terms of getting banned or comments removed, however that does not prevent those takes from being heavily downvoted. That may be "ganging up" but it's not censorship (not that this is the argument you made, but it's a common conservative refrain I hear)
When it comes to certain topics that will get you banned or your comments removed, that will depend on the community or instance. You must follow the rules of your home instance and the one you post to, whatever "debate club" talking point you have doesn't matter here. Some rules are implied or based on local law. Examples:
- Hate speech is regulated by Canadian law on Lemmy.ca, so anything I write that clearly appears afoul of that can be removed
- Lemmy.blahaj.zone is explicitly an LGBTQ+ safe space, so there's no room for debates related to genders and pronouns on those communities, regardless of what you think is normal in your culture.
- Feddit.org is beholden to German law so criticism of Israel (being conflated with antisemitism) is a touchy subject.
- Beehaw.org tolerates a variety of viewpoints, but if you act like a jerk or a troll about them, you will be quickly banned. "Bee nice" is vague on purpose to capture nuance rather than provide prescriptive rules and they have high standards.
- Lemmy.ml mods are less tolerant of Russia and China critical views, especially re: Ukraine.
The fediverse, as a whole, has a very loose set of shared values, but the idea is that if you can't have the discussion that you want, you go elsewhere to a place that you think you will. You have the freedom to move instances, each instance and its users have the freedom whether to accept you or not. Each instance has its own sort of culture, and if you think a ban from an instance was unreasonable, bring your receipts including account handles and modlogs to !yepowertrippinbastards@lemmy.dbzer0.com to get community feedback.