The question as asked: you can do it anywhere. Right here. In worldnews. Lemmyshitpost. Gardening. Whatever.

But I think you’re asking: where can I say whatever I want without consequences?

And that’s harder. Because if you have the right to subject other people to your opinions, that gives them the right to subject you to their opinions.

If you want to avoid being banned, create your own community. If you want to avoid your community being nuked by admins, create your own Lemmy instance. If you want a safe space for yourself, free from criticism about what you say, don’t federate your instance. You will be safe and able to howl into the wind without anyone troubling you.