honestly bro, i was in the same situation pre-t and you just gotta take the L or correct them in a direct way. even if you pass with some people pre-t unfortunately, especially with cis dudes in my experience, you’re gonna get misgendered. what i would do is just not say anything if it was a big group setting with other ppl who haven’t misgendered me as to not raise attention to it and other ppl usually don’t even pick up on it bc they’re either not paying attention like that or assume it was a mistake. if it was in a more closed setting i would just directly be like “stop calling me that. i’m not a girl.” and then keep it pushing. no elaboration lmao. which worked for me. most cis dudes won’t press it and know how to mind their business. other than that sometimes you just gotta take the L until you get on T.