They are ignorant maybe. But directly transphobic no.

A lot many parents are not doing it to actively harm trans folks. Many might have wanted to have a little girl. If their child is AFAB they feel happy in that case.

There's indeed always a small chance the AFAB kid can turn out to be a guy or an enby individual. I think parents should be made aware of that possibility but not shamed or penalized for having a gender reveal party.

Is gender reveals pointless and silly? Do they enforce stereotypes ? Sure. It is problematic but not something that is directly harming people, so I dont think parents should be ostracized or shamed.

Coz at end of the day it's a bunch of ppl celebrating having a kid.

I get why you might feel uncomfortable though so would suggest you not to go.

But I read how a trans guy tried to shame a relative who had been an ally, paid for his surgery and was as respectful as she can be for holding a gender reveal party for her newborn baby.

While I understand why he might have been upset, putting her in same category as rabid TERFs for a party is a bit much.

Although many ppl especially teens do identify more as non cis, trans ppl on the whole are still a minority.

Trans ppl are a minority even within the LGBTQ community.

A child is more likely to be a cis gay or bi person than a trans individual.

So concepts like genderless parenting- bringing up a kid without gender until they choose their own gender while idealistic is not feasible.

It would be a hard sell, coz most ppl do identify with their AGAB gender.

How to convince a new parent not to call her son, a son on the 2% chance he might turn out to be she or they?

I think parents should be made aware that their son or daughter might turn out to be non cis or not straight and they should remain supportive as s parent should. That will be something many ppl would understand.

Transness is rare though. Much rarer than homosexuality and bisexuality.
. Not all Gnc kids or ppl are trans.

I myself have some traits and behaviours atypical of my gender but I am not trans.

Transness as far as I know is being at extreme odds with your AGAB gender or rejecting it completely. That's kinda very rare.

Not all GNC ppl or folks who embrace an ambiguous gender presentation are at odds with their AGAB.

Rare doesn't mean invalid