Well put and indeed worth taking to mind.
However in open anonumous chats dedicated to sexual roleplay. I would say "on your knees" is atleast as good an opening line as the human toilet, adult babies, begging male subs etc offers.
If you dont want to be confronted with peoples fantasies. Well you shouldnt go to an anonymous chatroom where the rule is making contact by whisper's.
I dont do things that way myself, i use a wery polite introduction but that apparently makes the unexperienced subs think im not the real thing, thus keeping the "on your knees" kids supplied with fresh meat and reason for how they behave.
Rooms where you need a registred profile and in the context of some community is a different matter. No excuse for peddeling disturbing ideas when you can check peoples profile and tell if theyr into it or not. Even if they are your still making an ass of yourself by demanding.