I have to be real honest, this reads as your own insecurities and what you think others think about you. Never in my life has someone been upset about my making an honest mistake about their gender. Literally throw out a quick apology and move on. Also, it's the entire purpose of presenting your name and pronouns when being introduced. That way you know right away and can, therefore, not have to worry about being an asshole. And even then, if you slip up (as happens when learning new things), apologize, correct yourself, and move on. I assure you, treating others with empathy and humanity will never be an asshole move.