It’s ok! Men slides right up occasionally. The best thing to do if you hier use unsuitable pronoun for someone should be to state anything right away, such “Disappointed, I meant (enter pronoun)”.
Most of the day it could be tempting to visit into and on about bad you feel which you messed upwards otherwise how difficult it’s to getting they right. Please don’t! It’s incorrect and helps to make the individual that try misgendered end up being embarrassing and responsible for calming you, that’s absolutely not their job.