What it usually boils down to:thinking critically about any of this is not encouraged
"You are not allowed to have feelings about my entitled feelings!"
This 'message' ("you are transphobic!") has begun to preface any kind of mention of feelings or opinion towards transgenderism.
Hence, the discussion is over before it started, it is silenced.
Edit to add some nuance:
My comment was a response to @KiwiFuzz's post and is merely my perception from what I see and read on the internet. I don't know any transgender people IRL; I have no experience with actual in-person conversations. However, it is deeply concerning to read articles with more substance than run-of-the-mill online posts and realise that medical professionals don't even (dare to? want to?) go against the current. One "top-doctor" from a world-renowned transgender centre emphasised the importance of SRS surgeries because: "It is easier to change the body than the mind".