A pro-choicer being against sex selective abortions is a hell of an oxymoron
Not if women's rights is more important to you than cultural relativism.
Even though banning sex-selective abortions is a clear violation of women's rights?
It's hard for me to see how banning sex-selective abortions can violate women's rights when the vast majority of those being aborted in those procedures (especially among East and South Asian populations) are baby girls. Especially when you consider that these women are driven to abort them by the patriarchal cultural mores in which they are raised that deem sons as being more important than daughters.
It's at best a poor substitute to actually undermining those patriarchal cultural mores. People frequently seem to think that a legal change is as good as a cultural change, which is a rather short-sighted view of the matter. The legal change can act as a bandage over the wounds of injustice, but it doesn't actually change anybody's mind.
Besides, in the context of the United States, which the bill in question pertains to, there is hardly any evidence of sex-selective abortion existing, let alone it being a systemic problem. As I said earlier, this bill is an attack on legalized abortion.