I know several people who use they/them pronouns. "It" is dehumanizing and we don't have any other neutral gender singular pronouns. For this reason, sungular they has been an accepted pronoun in English for some time.
JUST MET A GUY WHO PREFERS THE PRONOUNS "THEY/THEIRS"; IT TOOK HEROIC EFFORT NOT TO ASK IF "HE" HAD MULTIPLE PERSONALITY DISORDER AND WHAT "THEY" WOULD DO ABOUT IT
