“I said, you don't have to treat them as women, because they're not.”
But they are.
“Biological sex cannot be changed.”
But it can. Not every transperson goes for it this way but yes it very much can.
“Wear a dress, who cares. But you can't change your sex.”
Yes, you can. Any time one of you will say it, I will correct you and I don’t care what circumstances it will be in.
“sports, bathrooms, children (briefly), women's support groups being invaded”
Yeah, that is a very hard NO to all three, while also the last one is a literal screaming tactics these days, used by Karenish mommys of underperforming schoolgirl athletes. It has been stripped and ripped apart by actual sports federations themselves, not to mention endocrinologists and all sorts of other medical specialists. Whenever you say it, you admit to most likely having a kid in a family you’d like to see take gold at something but don’t want to do it through honest competition, so disqualifying all better competitors sounds like a plan to you.
“I replied, biological sex is NOT an opinion; it's fact.”
Oh, it is, only you have literally the most childish, absurdly simplified 5 year old idea of what goes into that fact and thus are very likely to get that fact dead wrong with any given transfolk. That is why you will get corrected every time you spew your brained concepts like they’re medical journal entries.
“She admitted she can't process it when she comes face to face with TIMs. Even the brains of TRA-lites override their feelings in that split second.”
Your conversant had hard time properly addressing a person who has apparently a hard time of her own to place within the “acceptable” female esthetics, of course just like any good feminist, you have reminded her that outside looks and esthetics are everything a woman is and if those do not work out at a glance, you might as well be a man. Afterwards, you decided to use that particular anecdote and expand it into a universal law as it concerns transwomen. Cute. No, really. Personally trashed that notion you just put out there SO many times in my life, that these days I get to wear some trans pride pin or something on me just so I’m not automatically assumed otherwise.
“This insidious cult is harming so many kids who want to be kids and play with clothes and have fun with different roles.”
By the insidious cult we of course mean TERFs and their obsession with ignoring whatever a child can tell you about themselves and force them into the sterotypes they believe are the only ones valid. If you apply your words to transfolks, you are simply committing blood libel. Yeah, ever so sorry but as you said yourself, a fact is not an opinion. What I am presenting is a fact, what you were saying about my minority, is an opinion and a one that should get you in trouble with the law, based on libelling an entire community as pedophiles, absent any actual evidence and pushing it by bold-faced lying about “telling” children shit.