@goatsarah Hi, he did not actually say this; it was posted by a parody account.
See e. g. this article: https://insidethemagic.net/2023/07/david-tennant-leave-trans-kids-alone-you-absolute-freaks-mw1/
https://twitter.com/PoliticoForYou/status/1678695501313503232
https://archive.is/XvdO3