It's not exactly an argument in good faith if you're already finding ways, before I speak, to discount what I'll say, is it? Look at your framing - you're already assuming anything I provide will be fringe. You're already writing it off. Why? What do you lose by saying "hey, maybe there's some troubling issues around the Women's March?"
Here's one simple comment and response thread to consider, too:
https://twitter.com/alwaystheself/status/954842731955806213
The thread that follows it is an interesting read.
But - if you have access - I might suggest starting with "(Re)producing feminine bodies: emergent spaces through contestation in the Women's March on Washington," a rapid response by scholars published in Gender, Place, and Culture. The rapid response is meant to set a foundation for future scholarly arguments about these issues of erasure. Here's the abstract-
And from the piece itself:
WAPO reported on some of the back-and-forth around the marches last year:
https://www.washingtonpost.com/life...fb9411d332c_story.html?utm_term=.62b0803e3780
There's a good examination in this piece despite its length, but this is, I think, a choice quote for what you're looking for:
An article in USA Today of all places about efforts to make this year's march more inclusive, granting problems ongoing and in the past:
https://www.usatoday.com/story/news/2018/01/18/womens-march-more-inclusive-year/1038859001/
Cincinatti's BLM group dropped out, I heard, but that was messy all around from what I read. Whatever the unofficial story is beneath that, I can't speak to it. There are also many arguments about the formation of the platform for the movement and many are quick to point out that trans/Indigenous/etc issues were being added in, that the platforms were expanded, that organizers from marginalized communities were added - why didn't they start there? Well.
Sydne Gray's story of her experience at last year's march was powerful and at the time (I follow her) there was massive pushback on social media from people saying she was lying, exaggerating, that none of it was a big deal, she should just let the march be a success - probably many deleted now, I'm sure - but the meat of her story can be found here, too. This story says she's private but I think she unlocked her account later. Like I said, I follow her, so I wouldn't know-
https://www.huffingtonpost.com/entry/white-women-you-can-do-better_us_58877b68e4b08f5134b624b0
There's more. There's much more. It's not hard to find.