This is one part of the Libertarian philosophy that I agree with:
"Even the freedom of speech is limited by considerations of property. If a person visiting your home behaves in a way undesired by you, you have every right to evict him; he can scream or agitate elsewhere if he wishes, but not in your home without your consent. Does a person have a right to shout obscenities in a cathedral? No, for the owners of the cathedral (presumably the Church) have not allowed others on their property for that purpose; one may go there to worship or to visit, but not just for any purpose one wishes. Their property right is prior to your or my wish to scream or expectorate or write graffiti on their building. Or, take the stock example, does a person have a right to shout "Fire!" falsely in a crowded theater? No, for the theater owner hs permitted others to enter and use his property only for a specific purpose, that of seeing a film or watching a stage show. If a person heckles or otherwise disturbs other members of the audience, he can be thrown out. (In fact, he can be removed for any reason the owner chooses, provided his admission money is returned.) And if he shouts "Fire!" when there is no fire, he may be endangering other lives by causing a panic or a stampede. The right to free speech doesn't give one the right to say anything anywhere; it is circumscribed by property rights." ~ John Hospers, "What Libertarianism Is"
I note this because I think our existence in a cyber-realm brings up new considerations. What we do here forges new "rules" as we go.
While I agree that in public places, we do have the right to free speech, I agree with Hospers that we do not have that same right when we are on someone else's private property.
We all post here by the good graces of the owners of this forum. They maintain it, and for the most part, they bear the cost of it--for US. For all practical purposes, even though it may
appear to us to be a public place, this forum is their property.
If this were a place in terra-space where we all gathered together, then it would be apparent as a physical place, and as property--perhaps a fantastical pub on a ship sailing the stormy seas, eh?

And the forum administrators would be the captains and the bartenders. But we sail the cyber-seas, and although appearances may be deceiving, this remains a privately owned and maintained space.
That is how I look at this situation, for what it's worth. I grant to the owners, our captains and bartenders, the right to run this ship as they see fit. Our right to free speech is here a privilege.
All that is asked of us is that members show respect for one another and for the community here. Just common decency.
Edited to fix typos...