Muslims aren't "changing the rules" for everyone. They're exercising their same contractual rights that anyone else is entitled to in this country. And, those rights are to include a choice of law and/or private arbitration clauses in private contracts.
If you don't want to do business with people who demand that Sharia law is used in private binding arbitration, then don't do business with those people. That would be just like people who don't wish to do business with Hasidic Jews who demand similar private arbitration contract clauses using Jewish Law rather than Sharia Law
People who are running around with their hair on fire screaming "Sharia law is creeping into American courts", are (at best) uniformed with some basic, fundamental principles of American contract law.
"Your string of insults are proving nothing except that you are , as you say, an obnoxious prick."
No, my "string of insults" are in-kind responses to an argumentative ass.
Now explain why refusing to do business with people in an open forum (i.e. of business) doesn't expose you to civil liabilities for "antisemitism" or "hydrophobia" or some other b.s. charge, under the 1964 Civil Rights Act.
You don't have the right to "refuse service to anyone" any more.
And there he is, your customer, with a copy of the Sunna in his hand, all ready to do Sharia-compliant business with you. You're going to refuse, just because he's black/gay/Moslem/Jewish? You'll pay his lawyer damages, then.
Tell me that won't happen.
And stop being so obnoxious.