Your premise is wrong. A pronoun is not "silly" to a trans person! If your mother was misgendering a dog that would be one thing, but it's a person we're taking

Your premise is wrong. A pronoun is not "silly" to a trans person! If your mother was misgendering a dog that would be one thing, but it's a person we're taking about here. A human being. Your mother does not simply get to hurt other people's feelings because of her religion. It is still inappropriate to call all Christians mentally ill. I know plenty of Christians who have no trouble treating trans people with all the respect they deserve.