Did you actually read what she said in that Twitter thread?
She says she came across a group of "white, ostensibly middle-class cis women screaming hate at us"
So, for starters she was not personally attacked, targeted, erased, singled-out or subjected to "gender-based violence" which she sums the whole incident up as further down the thread.
Secondly, the group was there because we have been and are being contacted by countless young lesbians who are scared and upset because they are pressured by the LGBT community to accept males as sexual partners if those males identify as trans or non-binary.
If they object, they are ostracised, called vagina fetishists, bigots, transphobes and TERFs. They are harassed for their "prejudiced preferences" and told they could learn to cope with dick if they only tried.
Many young lesbians have no support groups they can turn to in this situation. And on top of this horrific homophobia dressed up in new clothes they also experience the old-fashioned type of homophobia, which seems not to have gotten that much better for young lesbians.
The group was there to signal to those young lesbians that they are allowed to say no to males, they are allowed to set their own sexual boundaries, to reject all males, no matter how they identify. And it worked because they were approached by quite a few young lesbians who came up to them to say thank you.
The group shouted things like "lesbians are female homosexuals" and probably "lesbians don't have penises" and other slogans in defence of the right of lesbians to assert their sexuality as exclusively same-sex attracted.
That your friend interprets this as hate and an attack and as she says in a later tweet "literal violence" and making the Pride march unsafe for males who identify as trans says more about her than the group.
Who actually faced real violence on that march, ie physical harassment such as having extremely loud bells and whistles blown directly into their ears (one of the women wears a visible hearing aid. Do you know how unacceptable that is to do that kind of stuff to her? They were also being shoved and jostled, run through, attempts were made to rip their posters out of their hands and they had stuff, including bottles thrown at them (and judging from the vicious abuse they got, they also had lots of what your friend considers as "literal violence").
And she is now contributing to that hatred against exclusively same-sex attracted females (aka lesbians) and further fanning the flames of hate because she is allowing her words to be interpreted as her having been personally abused by the group.
Of which exactly zero are cis btw, because none of them have ever accepted gender norms. And where the middle class bit comes from is anyone's guess. Members of that group are of all ages and circumstances. They include immigrants and disabled women and they come from all kinds of economic and educational backgrounds. So she's quite offensive in her assumptions, too.