Comparison is the fact of considering something similar or of equal quality to something else.
The things compared do not have to be identical, but they do have to be similar or of equal quality to each other to be a valid comparison.
There is nothing similar or of equal quality between the trans pride flag and the confederate flag. One represents a minority demographic that has not oppressed anyone and the other flag represents the white supremacist half a nation that fought a long and bloody civil war to keep Black people in slavery.
There is no comparison between the two, and attempts to compare, and thus conflate the two to push forth a feminist issue are classic white feminism appropriation of the atrocity of slavery and the oppression of Black people, including Black women.
It’s just as bad as the Nazi flag comments Barbera was making in her complaint. The valid concerns of women regarding single sex spaces while a serious feminist issue, is not at all comparable to the anti-semitism that led to the genocide of millions or the racism that led to centuries of race-based slavery.
There should be respect from all feminists for the scale of these historic atrocities. Comparisons to them should not be done lightly or as a way to cloak offended feelings in hyperbole.