Kate Hudson's Gender Reveal Party and My Confusion

So, all the tabloids and newspapers (as if there's a difference) shouted the headline back in April: Kate Hudson Reveals Gender of her Third Child.

Well, now I'm confused, once again.

I thought that "gender" was something decided upon by the individual. How long will we stand by and put up with this matristic, not to mention maternal, exploitation of gender determination? What about the rights of that poor fetus (yes, it's a medical, scientific term that all pro-life people should use) to reveal their (see? I can be fad-ish, too) gender? How callous and thoughtless of Kate Hudson to dare to presume the gender of her baby before her child even has the opportunity to voice their decision on this matter! What damage has Kate Hudson unleashed upon this defenseless fetus' psyche? In what other ways will they have to face up to their parent's oppressive gender-expectations? I pray that Kate and her spouse will see the (politically correct LGBTQ rainbow) light before it's too late.

Or, wait, did Kate maybe reveal the sex of her child? Could it be that there's a difference between gender and sex? Apparently: yes, at least according to that storehouse of contemporary knowledge, Wikipedia:

The distinction between sex and gender differentiates a person's biological sex (the anatomy of an individual's reproductive system, and secondary sex characteristics) from that person's gender, which can refer to either social roles based on the sex of the person (gender role) or personal identification of one's own gender based on an internal awareness (gender identity).[1][2]

I'm sure the LGBTQ (I refuse to learn more letters) community has considered this, haven't they? And surely, if only to absolve such a Hollywood icon as Kate Hudson from her outdated sexist biases, the LGBTQ-ers (ever so scientific in their polemic and politics) would agree that it is, in fact, okay for Kate to reveal the sex of her child?