Venicenporta: I think the key is what STX said: "It is his website." That pretty much means he can require anything he wants within the bounds of legality. But what awesum said as an alternative is also absolutely correct.
I am a former ultra-long-distance canoe racer and participate in a website on the Texas Water Safari. I have a really odd sense of humor and for years I wrote a column for our newsletter where I would absolutely slam and insult all of the racers. And they loved it. If I didn't insult somebody, they would get really insulted! And I don't like to use happy faces. I like my sarcasm to be obvious. But wow, when I started doing that on the website, the poor moderator, who did not know the history, absolutely had a gasket explode! He banned me and sent me a scathing letter. But after I abjectly apologized and told him it was his site and I would follow his rules, he backed off.
As you probably know, the tone of language on the internet can be extremely important. Noone of us are mind readers, and what you mean as an innocent remark can be taken badly by someone else. For example, some dude who grew up in New York could say: "Outta my way, Mack, I'm in a hurry." But if he said it to some good old boy from Dime Box, he might get decked, and wish he had said: "Say Podnuh, I hate to be pushy, but I need to get past you. Sure do appreciate it," it would be different ball game.
Russ