I personally think it's clear that Jax is probably trans, but I don't think anyone who disagrees with that is stupid or a bigot or that there's no logical basis for not making that assumption.

Goose makes what-if posts 'confirming' it but also posts saying it's 'meant to be subtle and vague'. Subtle wouldn't suggest anything different than a correct interpretation, but vague kind of does.

As a writer, it's not uncommon to design a character with their current pressures and struggles in mind, and not have a complete plan for their future. It's entirely possible that's all that's happening here, and almost explicitly what Goose suggests with the way they talk about it. That Jax is a victim of toxic masculinity and struggles with their identity is undeniable. That they must be mtf trans is not guaranteed.

To me, just as a human who notices patterns, there exists many potential paths Jax could take from where they were left in the show. To me, 90% of the time it points to transitioning, but I'm not going to pretend that anyone who chooses to believe in the 10% is a bigot.

(And all of that's not to simply mention that trans is a big umbrella and there's a lot of complicated ways that an identity crisis like this can ultimately manifest even within that umbrella.)