You’re able to call your parents “Mom” and “Dad”. They were not born with those names.
You’re able to call your teachers “Mr” or “Mrs” and their last name. You’d get in trouble if you addressed them by first name.
You’re able to call a celebrity by their chosen stage name.
You’re able to call your friends a shortened version of their name, their middle name instead of their first, or a completely random nickname.
You’re able to call a married woman by her husband’s last name, even though she was not born with that last name.
But when someone’s transgender, how does calling them by a name they were not born with somehow become a hassle?