It’s plain as a pikestaff that this letter is aimed at Let Women Speak. It’s intended to paint LWS as racist and extreme.
It’s attempting to distance those women from all the ‘correct thinking’ women, and leaves them more vulnerable as a result.
This appears to be at the heart of lots of the anger / critique of “the letter” on this thread. It’s a continuation of the “mean girls” trope. Ie that an accusation of racism is made purely as a weapon to attack women/ groups with who are disliked for some unknown reason, perhaps jealousy or a vague bitchiness or a superiority complex.
To portray things in such a shallow way (rather than perceiving that people are genuinely concerned about racism) suggests that either people know otherwise but are being disingenuous, or that they genuinely believe this. If the latter, then it speaks to a lack of emotional maturity - they can’t help but project their way of thinking and behaving in the world on to others. For them, people point out things like racism, purely as a personal vendetta rather than because they might care about racism.
Even in the event that someone disagreed that x is racist, if they were sincere and had a level of emotional maturity, they would be able to perceive it as “this person thinks x is racist and has therefore called it out of racism. I disagree and will explain why I don’t think it’s racist but I can see that their intrinsic motivation, although imo misplaced, is that they care about racism”.