Wow, it actually says "whites only". This isn't some case of someone waking up angry and tweeting about christian mingle or someshit, its actually just racist.
Same with events that exclude attendance based on sex/gender.
There's a time and a place.
For example, a "women's only" group may be for a group of women who are healing from a sexually violent relationship, so they really don't want to see men there.
But a parent and child group that excludes races? That just a gross kind of bigotry.
For example, a “women’s only” group may be for a group of women who are healing from a sexually violent relationship, so they really don’t want to see men there.
"Maybe that whites-only parenting group could be healing from some trauma caused by POC and they don't really want to see POC there."
Do you see the problem? A POC causing you trauma is not a good reason to reject POC people in general, and a man causing you trauma isn't a good reason to reject men in general either.
A group dedicated to victims of domestic violence could easily encompass both men and women who have suffered from it, whether the perpetrators were men or women. Cis & trans, it bears saying.
A person who has a blanket phobia of people of a particular gender or ethnicity needs therapy to address their sexism/racism. "I don't feel safe around men" has the exact same energy as "I don't feel safe around black people".
Is that the best argument you can put forth against what I'm saying? I can give you some more ammunition: I'm queer, disabled, atheist, an immigrant and vote green. Or perhaps those are collectives that you don't feel comfortable discriminating openly.