Explained pretty much in this article. I think what he posted was perfectly reasonable.
"Australian actor Guy Pearce has issued a lengthy apology after sparking a social media firestorm with a now-deleted tweet about transgender acting roles.
The 55-year-old, who famously played a drag queen in 1994's The Adventures of Priscilla, Queen of the Desert, came under fire for questioning whether or not only transgender actors should be allowed to take on trans roles.
The Emmy-winning actor tweeted on Monday night: 'A question - if the only people allowed to play trans characters are trans folk, then are we also suggesting the only people trans folk can play are trans characters?"
https://www.dailymail.co.uk/tvshowbiz/article-11913741/amp/Guy-Pearce-posts-extraordinary-letter-apologising-trans-tweet.html