OK, Trauma, I'll try this again because I like you and I might run into you today at Hemp-Fest.
Let's make a less extreme example, again using your home as the setting.
There is no law against putting your face into a plate of food and sucking it in making loud noises as you do so. (At least not in this state.) Yet, do you need to instruct your dinner guests in writing before serving a meal that this sort of thing is disgusting to the rest of the diners and will not be tolerated?
I would suppose that when groups of civil people congregate, it is assumed (or hoped at least) that certain decorum will be observed. It is not unreasonable nor completely restrictive of personal freedom to expect such.
I once asked my brother-in-law to stop telling ethnic jokes while in my home. Did I restrict his freedom? Yeah, somewhat. But I did not want my children exposed to this sort of offensive behavior. If Simon, or someone acting on his behalf, asks a poster to refrain from material offensive to abuse-survivors does it restrict their freedom? Yeah, but same deal.
Is this making any sense at all to you?
BTW, are there good second-hand fumes at the festival?