ah, freedom from gender norms! I think everyone, cis and trans, has different tolerances for the extent to which they feel comfortable adhering to or violating gender norms. Ironically, transitioning has been so great for me because it allows me to finally be "normal" by being conformist.
As a man I was always wrong because my natural inclinations made me gender non-conforming (making me seem like a gay man). It was very stigmatizing living that way, but once I transitioned it's like everything lined up and now for the first time every I "fit" society, and I just live as a relatively normal woman without stigma.
However, my sexuality still makes me non-conforming, but in women that seems to be more ignored or overlooked compared to men (esp. when you are feminine / conforming in your gender expression). It's only when it's made explicit that people seem uncomfortable, and even then the average person seem more accepting than of gay men, at least in my experience.
That said, it makes sense that being trans would lend itself to seeing the possibilities in gender and the freedom from gender norms that can be accomplished.
The popularity of beyond-the-binary ideas of Kate Bornstein and Leslie Feinberg and the increased adoption of non-binary as a political identity show a thirst for tearing down gender norms and replacing them with gender freedom (particularly focused on individualist ideas of gender expression and non-conformity).
Though I am ultimately skeptical that this is how gender works, and it reminds me of the failed political lesbianism of second wave feminism, the problem then was that sexuality was not wholly cultural or political as mistakenly assumed, and you cannot will yourself to be a lesbian and build a new utopian society on that basis. Straight women exist, and they will continue to be attracted to men even if it's they're told it's wrong. Still, it's exciting to see movements like this push to create space for gender non-conformity, that's a win regardless in my book.