Either the topic of trans people just hasn't come up before, or they mention it in some other relevant discussion like that of childhood or dating, and so that's how you find out after you've already gotten to know them a bit and started becoming friends.

At that point would it surprise you since you didn't know? Would it make a difference how you interact with them moving forward, or would you just accept it and continue as before? Would you be angry they didn't mention it sooner even though there's not romantic interest? Would you even stop being friends because they're trans, even though you have been getting along well so far?
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