Trans people probably don't spend much time reading stuff describing why they are human and debunking arguments to the contrary so might not have such sources on the tip of the tongue.
That is like, half true. I've talked with people who are skeptical about aspects of trans experience or something, I've written essays about it. Usually people are just curious. In you post, there is just not much info that you have provided to debunk. Like do they actually think that a part of the population is not human? That is pretty far gone, I'm not sure there is anything to be done.
As others have noted in the comments, "bourgeois decadence" is simply absurd and not a marxist approach to organising. For the TERF point, they are aligned purely with right-wing groups, I don't think the distinction between "actual old school feminist" and fash is relevant. When you are aligned with anti-communists in your goals, I think there is some major self-reflection to be done.
What you just said is completely incoherent