I love "they." I've even been using it with people who appear gender conforming but I don't specifically know their preference.

Old ‘They,’ New ‘They’ — Language Change in Action
#Language #SensitivityTip #WritingTip #QuickAndDirtyTips #KirbyConrod

“The reason people struggle is that there are really two uses of singular ‘they’: an old use, which has been in use in English as far back as 1375, and a new use, which is part of a big language change in the 21st century.”

https://www.quickanddirtytips.com/articles/old-they-new-they-language-change-in-action/