A couple things I already saw in the replies.
Some transfem people are legitimately jealous and envious of our "ability"/curse to get pregnant, have periods, have boobs, vulvas, etc.
They, more often than not, do not have those things. There might be some intersex transfems, even if i don't personally know any, and they might have some of the above. But, for the most part, transfems do not have any of those things because they went through a very different physical development, and now they're mad about it and taking it out on transmasculine and nonbinary people who do have the above features.
They don't see us as trans.
Some of them see transmasculine people as broken or defective cis women who are on some kind of Testosterone Trend, others see us as cis men who experience male privilege. Regardless of the position on this, it creates an awful dichotomy of them versus us where there is no trans community. Seeing us as one or the other allows them to ignore our points on healthcare and transness because we aren't really trans or we don't know what we're talking about.
They are taught that we have the exact opposite experiences, even when it makes little to no sense in real life.
This one I'm not entirely sure who to fault, however many of the worse ones I've seen have spread the belief that transfems experience [insert genuinely awful thing] and so transmascs must not only never experience it, but also experience [insert huge list of only good things]. Awful way of putting it, apologies. Typing this with early morning brain fog.
As said in the replies by another kind fellow, they are told and some believe that they experience some worse version of what cis women experience because they are seen as women even still in the egg. Something in their texts or the logic that came afterwards went the wrong direction, because they then turned to transmasculine people and said we experience the exact opposite. Personally, I think they thought of it the same way these things affect cis people, because with cis folks that is about how it works. Cis women often experience the opposite of cis men, however this is not how it works with trans people. We are all treated very similarly for the simple fact we are trans.
We are seeing more laws currently targeting transfems, particularly when these laws make the headlines and transmasculine people are hidden in the small text below.
Many laws targeting transmasculine people, particularly the ones on Testosterone like myself, were drafted and approved years ago. The law that effectively banned transmascs from sports and many athletic communities was draftedâi don't know the exact dateâI believe somewhere in the 70s to 90s and is still law to this day. Meanwhile, transfems were only banned recently. Other laws that affect all of us are usually headlining with things like "Transfems banned from bathrooms!" and similar such lines that only show one side of the story.
In truth, we're all being banned from bathrooms. Transmascs already aren't accepted at womens shelters, gynecology clinics, and are excluded from the drafting of laws that would affect access to birth control, miscarriage and abortion care (often the same), pre and post natal care, hysterectomies and other surgical sterilization options, cancer screenings (cervical and breast cancer), and more. They don't see that we're affected by these things because we are left out of the discussion entirely, so they assume that we simply aren't affected, because if it isn't talking about you, why would it affect you?
It doesn't state in the descriptions of the laws being put into place people with uteruses, vaginas, breasts... it says women, it says girls, it same females or people assigned female at birth because that is how the people in charge view us. All transfems see is laws outlining what perisex cis women are losing, not what transmascs are being barred from.
Similar vein to an above point. Some of them do think of us as though we were cis men, which has a hidden, ridiculous layer of thinking we don't need this healthcare because we are not women, therefore we mustn't have problems with any of this. It's absurd, at least to me, and I do genuinely hate it.
Bonus points I'm going to include. Some of them break down transandrophobia to trans and androphobia.
At least where I'm from, we are not taught that men in minority communities are often the target of harassment and discrimination based on the fact they are men in their minority. POC, native, disabled, gender nonconforming, etc. are often treated significantly worse than what is often seen as the Default Man. Being a trans man would put someone into a minority community, but all they see is Man, completely missing the trans part.
Some of this might be completely incoherent and I am sorry for that. As I said mid-post, it is early morning for me, I only just got up within the last hour and it's taking me awhile to boot up.
Have a good day, I hope life treats you well.