This is what the boy said when questioned by the police:
In his police interview, Boy Y was asked why in messages he had referred to Brianna as 'it'.
He said that he would make jokes about 'gayness' with his friends but he didn't actually care if anyone was gay or not.
The boy doesn't even seem from this to have differentiated between being gay and being trans. The pairs' initial intended victim was a boy. The other potential victims listed were also boys.
Stop trying to use the murder of a child to shore up your ideology.