OH?
LET THEM take the _____ back to wherever they and it came from
I’m fine with that. Though it should be noted Orthodox rabbinic law has a good bit in common with sharia, especially in divorce cases.
Why do you object if A and B ask C to settle a dispute between them, using whatever “laws” or rules they see fit? How does that injure you?
If and when somebody tries to impose sharia on non-Muslims or make shari rulings legally binding even on Muslims, I’ll get as excited as anybody. Till then, no big deal.