I dislike these types of puns because they only make sense in one direction.
False. This pun goes in both “directions” (not sure what you mean by that, using your definition):
“They slash them” with slash as a verb refers to slashing someone, therefore hurting them. That answers the question “How do non-binary people hurt each other?”.
They slash them (they/them, “slash” is how “/” is pronounced out loud) refers to gender neutral pronouns, often used by non-binary people.
False. This pun goes in both “directions” (not sure what you mean by that, using your definition):
“They slash them” with slash as a verb refers to slashing someone, therefore hurting them. That answers the question “How do non-binary people hurt each other?”.
They slash them (they/them, “slash” is how “/” is pronounced out loud) refers to gender neutral pronouns, often used by non-binary people.