Pronouns are mandatory, not preferred. One of the easiest ways to respect trans people is to respect our pronouns, even and especially if they aren't what you expect. My pronouns are she/ her and they/them. Some of us use multiple pronouns. Most non-binary people use singular they/them/their pronouns. Additionally, many trans and non-binary people use new pronouns such as: zi/zir/zirs, hi/hir/hirs, ze/zem/zyr or ey/em/eir.