"hey medium-tier friend, uh, i wanted to tell you that i'm coming out as trans. like, i'll be living as a woman. not many people know at this point so PLEASE keep this to yourself. no #cistricks, okay?"

"yes, of course. what's a cistrick?"

i later found out they blabbed to various acquaintances. and then acted like they were the wronged party when i expressed displeasure. and next time our paths crossed at a tradeshow they avoided eye contact as they walked past and pretended i didn't exist

i fell prey to this classic cissism at least twice, the last time with my then-boss and HR. (do not trust HR to protect you or keep your confidence.)