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Simple. Show them this.
No amount of sentiment will ever change their mind when it's written as a deconstruction or a well-articulated debate. People who do this do it out of comfort, along the same line of thinking as grown men who become bronies; they long to be liked, accepted and comforted in a group, and even if it isolates them from a far larger group of people the soft knowledge that they will be immediately accepted and catered to by becoming "trans" is what does it.
Show them this picture. Make more like it. It's the best way.
