People whose behavior and/or appearance makes their sex difficult to guess provoke, in me, if not feelings of lack of safety, certainly discomfort (I am a tech guy, with a tech guy's notoriously poor social skills, I find discovering what I am expected to say, socially, something of a challenge even when the sex of the person I am supposed to interact with is clear), and, lately, thoughts that I should consider the real risk of harm if I fail to navigate the minefield of pronoun expectation perfectly.
Guests wanted. Candace Owens need not apply.