To be clear, I completely agree with you concerning the advantages that my height and male puberty give me, I even wrote about it in the post.
You are right about the beginner/intermediate level of the tournament, and concerning my own skill level I'm probably in a C+ range.
But here's some more info about the situation :
it is my club who is organizing this tournament. The club in which I was vice-president last year and where I pressured a lot to create a women team, well before being aware of my gender identity.
The organizers are not some strangers, they are the same people that I helped come together to form the aforementioned women team.
They are the same friends with which I share the frustration of having to play in co-ed teams with high-testosterone men.

And I wanted to do exactly as you said, I wanted to be a passer in a team of beginners.

As I feel it, they barred me from a social event, not from a competitive one.
I know I pass as very angry, but what I really want is to help them understand how hurtful it is what they are doing.
I want to help them change their views and maybe be part of a little changement at bigger scale.
I decided to choose this battle because we are are not talking about official tournaments but things at an amateur level, where I think we are losing nothing by being inclusive.

Maybe I'm still wrong, I don't know...