This comic is a good illustration
(please....click on the link)
Saying Black Lives Matter is segregationist is very much like saying "support breast cancer research" is doing damage to research on the other cancers.
Honestly - I used to think that All Lives Matter would be a better, more apt battle cry. That was until I saw some actual racists exercising their actual racism on actual people. On actual Black people.
I've seen it impact all sorts of races and ethnicities, now....and the truth is - it's not even the same. The racism my friend's Korean husband gets is different from the racism my friend from Mexico gets. And my Black friends and co-workers, they get it differently too.
Me? I'm white. So no way in hell am I going to tell any Black person in America that BLM is too isolationist, too confrontational...that we, the white majority, are feeling left out.
If you think it's wrong to say Black Lives Matter - because it somehow implies that Black lives matter
more than other lives - then it's pretty safe to say, your assumption indicates at best your myopia, and at worst, your unconscious (or conscious) fear of Black people. And
that is what is segregationist.