Censoring slurs is a choice made by your instance, not currently a setting users can change. If it’s not something you want done to your comments you’ll have to make an account on a different instance.
To see what instances are defederated (blocked) by your instance, check https://lemmy.ml/instances The content from these instances isn’t really removed by .ml admins, it’s just never sent to the .ml servers to begin with.
You can also view your instance’s mod log here to see what has been removed and why.