I think there's so much to be said for the ways society And individuals denigrate, abuse, and talks about fatness and transness in identical manners. If you are fat or trans society tells you:
-You are inherently performing femininity WRONG (& masculinity to a lesser extent) and are punished thusly and barred from most any potential societal Benefit of this gender
-You are less likely to get a job, to get a promotion, to be paid equal to your peers, to be treated as competent or with compassion by random members of the public and staff
-Clothes aren't made to fit you, and the few that are come at extremely high prices. Most dating apps aren't made for you and you get a clear lack of attention that isn't fetishistic
-It is your Choice and your Fault all at once, and if you would just try harder to dress correctly/defoliate yourself/exercise/eat right/fit in and stop Choosing To Destroy Yourself you'd 'be happier and life would be easier for you'
-Seen as an inherently bad parent, ESPECIALLY if your child takes after you, no matter what you're doing to support and uplift them (because their "failings" are ALSO your fault and they'd just be happier if they and you- etc etc)
-Just don't exist in the world of tvs and movies. Are scrubbed out of casts and even background characters, unless you allow One Token Character who is either a martyr or a punchline.
Then you have potentially the most important aspect of overlap - the ways we (many, not all) abuse ourselves bc we've internalized the idea of what a real [insert gender here] looks like and must embody that specific image to be a valid, real human worthy of moving forward in your life and relationships. See:
-The need to physically carve away that which makes you dysphoric and ill to look at (unfortunately for many, without ever really addressing and shaking loose the beliefs that make you think THAT specific narrow window is what a Real Person looks like)
-Extreme dysphoria around clothes and shopping, around dressing up for events especially formal, around being in pictures, around dating
-Lateral violence of who's Really Fat/Trans enough to have Actually Struggled. Defining these identities BY their struggle. Assumptions that anyone who is Actually Trying simply Become their True Appearance overnight and are magically handed all previously lost (plus new!) societal perks despite those being EXTREMELY conditional to the body type/whiteness/financial means/daily choices they make to pass well enough
-The Worst and most Draining Offender, the Mind Killer, the Parasite Society has forced you to ingest: The True me only exists in that future version in my head where I match what society says a Real Person looks like. I am not worthy of living my life in my current state, but everything will change overnight once I look how I Should. I'm waiting for that day to live, and I'm punishing myself for not being there. Once I am there, the past me was simply a prison, a facsimile of myself, a fake puppet mask I wore until I could drop it and be accepted as the me I always was but no one believed in until I tranformed physically through major medical procures or weekly shots. Ideally we'd be in a world where everyone could have this freedom without physical changes, but so many (not all!) of us are deeply ashamed of and hate that past version of self, and would rather enforce the same policing that was used on us to bully and minimize them into changing the exact way I did. (Bc if I could've been accepted externally without change what does that mean for the knowledge that I HAD to reach this goal there was no other way to live)((bc if I was just aiming for Society's Idea of what I should look like what does it mean if I cant maintain and lose that external validation of self))(((bc what if I never came up with my OWN idea of what the Ideal Me was beyond those external images and expectations, and once the conditional boost of others accepting me is gone I realize that in many cases I still don't accept v much of me)))((((including my past self which is, again, dead and buried and a lesser person and version of me))))
I actually thinks there's a lot of overlap between many marginalized identities and the way society and ourselves police each other. But every time people try to talk about it someone will pop up and say "LMAO OP thinks these two identities are the exact same experiences LMAO what a reductionist idiot who understands nothing and is actually just being [insert -ism] here for trying to convince us that we *mocking tone* 'have more in common than we think' and 'could relate to each other and ourselves in radically different ways acknowledging that and create solidarity' or whateeeeeever." But those people want to keep us divided and separated, working on specific goals and praxis that you're not allowed to disagree with in ANY WAY or you're an antagonist idiot who should be discarded. Those people don't want class race gender appearance solidarity, because they need to be the ultimate victim and argue about how privileged [enter almost identical and also extremely marginalized in law and daily life identity here] is so they can keep that cop in our brains happy and feel like they've found an acceptable outlet for bullying.
Anyways. All this to say that we have more in common than we think and leftist circles leave out fat people and discussions of the ways they're second class citizens as well WAYYYYY too often. And that examining the way our dypshoria and ideals manifest gives us much more power in self determination and choosing what WE want to be so that WE accept and love ourselves and can accept/forgive/embrace/and love our past selves as well