For instance, if you decide that you want a Twitter feed that excludes porn, gore, racism, and other objectionable content, then you absolutely should be able to exclude those (I'd reckon that that'd be a very sensible default). If I want to go observe the crazy bigoted things that fringe groups are spewing, or if I want to use Twitter just as an endless feed of porn, then that doesn't affect your ability to not see those things.

Likewise, I've not heard Musk propose banning any of his critics or opposing viewpoints (though I don't really follow his actions, so it's possible I've just missed them).