If I’ve worked with you for 6 years and you change your pronouns 6 months ago, I’m guaranteed to screw it up at LEAST 50% of the time. It’s not AT ALL that I don’t want to support you. I have coworkers who have been married for 10 years that I sometimes call by their maiden names. It’s ingrained already. In a generally supportive environment, it’s not always an intended slight to get your pronouns wrong. Before being upset, please consider that it can take a long time to undo 6 years of a habit.