It's great you've admitted you're confused.
You find it weird (that's more of a value judgement than confusion but never mind) that I care about whether or not another human has a dick? For me personally it's because I've been raped twice and seriously sexually assaulted once, all by humans with dicks. Groped countless times also by dick weilders in my university city and mugged once but that pales into insignificance.
Because I'm a mammal and because I have PTSD from the above, I'm acutely aware of the sex of my fellow humans. I structure my life to avoid as far as possible being alone with unknown males. I am hyper vigilant to warning signs that a male might be abusive BUT, exasperatingly I have a trauma response of freeze and appease. Sure this response might have saved me from being seriously injured by my rapists as a teenager but it also means I can't be sure I can rely on myself to flee an uncomfortable situation. Especially if there's social pressure to stay.
I am not afraid of lesbians because no woman has ever sexually assaulted or groped me. Not surprising when statistically well over 90% of violent and sex crimes are committed by men. Lesbians have hit on me before, I've turned them down because I'm straight, and there's been no issue. My sexual attacks were far more about power than they were about attraction. That's really important for me to understand. Otherwise how as a straight woman am I supposed to enjoy a fulfilling sex life with men ever again?
Only one of my attacks was by a known person. The other two were strangers and in public places. I'm not sure why you think I should not fear attack in public toilets?
I don't hate trans people any more than I hate Catholic people. I share the beliefs of neither but tolerance is a core value. I don't fear transwomen any more or less than I fear men in general.
I hope, genuinely, this goes some way towards clearing your confusion.