I am transfeminine no mistress needed

Being trans is a situation one is born into. No, trans children are not cis kids who are being manipulated or abused by parents because it's "trendy". That shit is just a modern reworking of the "gays are recruiting kids into homosexuality!" bullshit from the 70's and 80's.

Trans women are not "biologically male" and trans men are not "biologically female". Transition causes massive biological changes; trans men who are on testosterone and have had a hysterectomy have far more biologically in common with cis men than with cis women, and trans women who are on estrogen and have had reconstructive surgery have far more biologically in common with cis women than with cis men.

The existence of trans people is not a recent phenomenon, and the number of trans people is not increasing. Trans people have always existed; there are just more out trans people now.

Trans women are not gay men who attempt to become women in response to homophobia, trans men are not women who attempt to become men in response to sexism, and trans people would still exist and still need to transition even if both homophobia and sexism were eliminated.

Many trans women are bi or lesbian; many trans men are bi or gay (attracted to other men) (see p.28-29)

Allowing trans women and girls to use the same public facilities as other women (e.g., restrooms, locker rooms, etc) does not put cis women and girls at risk

That there are not more trans women than there are trans men.

Most trans people are not visibly identifiable as trans

Being trans and/or transition is not biblically condemned, and being trans/transitioning is not universally condemned by mainstream religious organizations

Spelling and grammatical notes:

It's transgender, not "transgendered"

It's dysphoria, not "dysmorphia". Dysmorphia is an unrelated anxiety condition on the OCD spectrum.

Transgender is an adjective, not a noun. So there are transgender people, but nobody is "a transgender".

The word cis is a Latin prefix, not an acronym, so there's no need to capitalize it as CIS. Cis is short for cisgender, which is the opposite of transgender. The prefix cis- means "on this side/on the same side", while trans- means "across/beyond/on the other side". E.g., cislunar vs. Translunar orbits

Faux pas to avoid:

Don't ask about our genitals unless you're our doctors or there's mutual interest in sex. Don't ask about "the surgery" either, which is still really just asking about our genitals

Same goes for the graphic details of our sex lives. Unless we're already in the kind of relationship where we casually discuss these matters, it's none of your business

When talking about something a trans person did before they transitioned, refer to them by the name and pronouns they use now unless they have specifically told you otherwise. It's like talking about someone who used to be married to an abusive asshole, but has since divorced him and stopped using his name. Even if talking about something she did while still married, I really hope you wouldn't call her "Mrs. Abusive Ex". That would be spectacularly tactless. That's not her name now and not how she wants to be known.

Never out someone unless they have given you explicit permission to do so. Don't assume that because they're out to some people that they are comfortable having others know that aspect of their medical history

In bathrooms in general, nobody's looking at each other's private parts. There are stalls, in well-designed bathrooms, and there are barriers between urinals, basically, it just doesn't even matter what bits someone has.

The amount of distress you experience at having trans people in change rooms with you... I'm sorry, but it really is fucking nothing compared to the distress caused by not being recognized as the gender one is. Like, occasionally you get a little uncomfortable, and then go about your day. But a trans person risks violence, verbal abuse, social isolation, work discrimination, etc.