The anti-trans-ness is almost certainly related to the prevalence of biological determinist views of gender at these marches ‒ centering being a woman/womanhood on the possession of certain sexual organs, etc.
Sorry comrade, this is another Kellyanne Conway "alternative fact" moment. Craftwork, where did you see or experience this? Please give details.
And when you say "these marches, " are you referring to ones in the U.K.? The U.S.? Or elsewhere?
Generalizations like this can only come from a position of ignorance.
Case in point: San Francisco's first Gay Pride Celebration was in 1970 with attendance in the tens of thousands. Although it had only 30 participants, transsexual "hair fairies" preceded it with a march down Polk Street, which was the main gay district at the time. In 2004, on the Friday before the main Pride March (which is always held on a Sunday), the first Trans March was inaugurated, becoming the largest trans-specific event in the world. The first year had 2,000 marchers, it doubled the next, and has grown to about 20,000 in the last few years. The main Gay Pride Festival and Parade recently reached a peak, at around 1,800,000 attending.
So to say that events in other places, that you are completely ignorant about, have elements of "anti-trans-ness" is a straight up lie.
Not only that, in 1966 (3 years before Stonewall in New York) transgender insurgents sparked a multi-day riot in San Francisco's Tenderloin District, the first riot of its kind in the world. See the 2005 documentary Screaming Queens: The Riot at Compton's Cafeteria to inform yourself about this history.
And please don't generalize about things you know nothing about. At most political events in San Francisco -- and the Bay Area more generally -- not only are transgender comrades present, but at times they're front and center (not that transgender oppression has ended, but at least there are conscious attempts to fight against it).
The anti-trans-ness is almost certainly related to the prevalence of biological determinist views of gender at these marches ‒ centering being a woman/womanhood on the possession of certain sexual organs, etc.
As for the cop-friendlieness: