The simple answer is; it won’t work. It works in theory if - and only IF - all people involved will automatically behave on their own and treat all others with respect. An open-to-all social media website without any moderation at all will attract assholes sooner or later, and it will turn into a shitshow eventually. The question is not IF it will happen, but WHEN.
What you are asking for is like planting a garden full of flowers, deciding to never ever weed out the plants you don’t like, and then wondering why you end up with an overgrown, tangled mess instead of a flower field. It won’t magically regulate itself just because you don’t want a gardener.