Like, on HN, if I talk about certain things I get downvoted to hell. So I talk about them elsewhere. Every community has its own biases, and people have different personas they apply to each community.
The fediverse is not a community. It's an ecosystem of loosely-interlinked communities, in about three or four layers: you've got the whole fediverse, the people on your instance, the people you follow, and the people you interact with. (On most instance software you also have topics, though not on Mastodon. There are hashtags too but they aren't used all that much and rarely does a community form around one, though they're useful for discovery.) You've got more potential points of segmentation than on Twitter, and more levels of potential control over what you see. (Add the possibility of having an account on several different instances and keeping to local rules and topics for those instances, and you have even greater control over how you present yourself and how your discussion goes.)