Because it probably means you are a lot looser about your pronouns than most like my sibling is they/them but if they are called a boy there fine with it but if there called there birth gender “girl” than they get uncomfortable so maybe your fine with Bieng called they/them but there not your pronouns I think. Usually I just call everyone they/them because they/them is nonspecific so if I get there pronouns wrong then I feel bad so I just say they/them because it’s easy lol this was long OwO