we Call him Buttergasp because of his gasp when a female interviewee said she didn’t think you could be born in the wrong body. (Sorry I’ve forgotten who she was!) that means he really thought you could. Like a lot of people who lack critical and logical thinking skills, or are just so desperate to be on the supposed moral high ground that they suppress them, BB took in and believed what the trans lobby were saying on the basis that they are an oppressed group exactly like gay people, they must be the experts on their own situation, and it would be bigoted to disagree with them.
There are teachers, health staff, parents and many others still saying you can be born in the wrong body and that a trans person is a poor unfortunate who is literally (for example) female in some deep sense but stuck in a male body. They think that because they were told that by supposedly authoritative sources. Even if those sources have started to backtrack, that idea is out there now being passed on as if it were true.
it’s a long journey from there to really starting to see how it makes no sense, is being exploited by predators, is causing harm, is regressive and sexist and homophobic, and is based on no evidence - especially when it’s been drummed into you that daring to have any questioning thoughts at all makes you a bigot on a par with racists. On that journey a lot of people go through a lot of confusion and cognitive dissonance.
I’m not excusing BB’s past idiocies but he’s just one of millions of people, many of them originally well-meaning, stuck in this mess.