Almond, I agree that Julie is causing divisions between women with articles like this, and I see why you would question her feminism because of it. I do think she should be criticised about her remarks about mothers. I wish she would try and bring women together instead of creating rifts, especially considering the backlash feminism is experiencing currently.
Lass was "pointing out the opposite of the groups Julie has critiqued. Lass did not actually say anything negative about plain looking women, lesbians etc."
The difference is that working class people, lesbians and "plain looking" women are not socially privileged groups, their opposites are. I have asian people in my family, and they often say disparaging things about white people. However, I would not use their race against them to prove a point, if I did I would be a member of the dominant group attacking a member of the subjected group. Power is always held by the dominant group. It is easy to drill up hatred for already despised groups, and cause divisions. That's why I objected to Lass' comments. What she was doing was accusing underprivileged groups of reverse discrimination, what she calls "inverted snobbery".
I do not believe underprivileged groups are capable of reverse discrimination, as they do not have any real structural power to be oppressive. I think there should be more understanding between different groups, but privileged groups do have to make a conscious effort. Because they are often unaware of their privileged status, they take it for granted, which of course is the privilege.
"I'm wondering about some rationale for her particular stance"
Julie's remarks about mothers i.e. Maternity pay, "breeders" etc., are unacceptable, mothers (as a group) are not capable of oppressing anyone. I think Julie believes mothers are privileged, and that is why it is ok to say such things about them. I know quite a few single mothers, and I certainly do not think they could be described as privileged. I think she is wrong for thinking mothers as a group are privileged, over women without children.