General “you”, “you cannot expect to…” apply to everyone. I have no interest in what your birth certificate says. Yes, based on prioritising trans special treatment over women’s rights, people might make certain assumptions about a poster which might “piss women off”. Why women in particular, and are you including transwomen? Would they be angry if someone correctly assumed they were transgender?
LGBTQI+ so sexual orientations, a group known for denying that sexual orientation is based on biological sex, and male and female people with disorders of sexual development? Doesn’t seem the most cohesive or related group, but whatever. Don’t know where you’re going with “have your own march” stuff. Forgive me, the “T” addition seems recent so I had thought the gay and lesbian alliance started off as such and would not enjoy having their orientation denied or having to pretend it’s based on gender identity. And you forgot asexual people, it is in fact, LGBTQIA+.