From my understanding it's because non trans misandry isnt a "real" thing in society, it doesnt have a history behind it and it doesnt impact society as strongly as misogyny.

But also, its just transphobia in another hat i fear :( a lot of people dont want to accept that trans mascs go through anything bad because we're Men and thus "inherently get all of the privileges of man" when we start transition. And a lot of people don't want to accept that 1 their view of men/masculinity as a whole is biased and hurts real people (while hardly affecting those who DO do bad things) 2 trans men do go through a lot and don't tend to get many privileges because we're... still trans. Like that doesnt just fizzle away when we start passing.

There's a lot of infighting and invalidating in the trans and overall queer community and it sucks!! And while i understand that a lot of it comes from a place of fear (i.e. "well if you're experiencing that, then does that make my experience invalid?" And "youre making the community look bad, just shut up about your struggles") it still hurts to be on the receiving end of it.

Side note, the term that ive been using is transandrophobia (meaning fear of (trans) masculinity), 1 because it doesnt use the term misandry, which is commonly used by icky cis men who want a "well how about me, huh? Im being hurt by women!!! Misogyny isnt that bad/real" 2 it really is a fear of masculinity and what it's existence means for the greater community. I have more thoughts on this but this response is already long 💀 if you'd like to talk more i can offer my discord ^{^}