You would think that if feminism was about watching out for women's interests, it would also watch out for their heterosexual interests. Yet some feminists seem to view women's heterosexual interests as counter their political interests, when those women have preferences for traditional gender dynamics.

No disagreement here.

In some conversations with feminists about pickup techniques, I often get the sense that they look down on the women who respond to particular techniques. For example, in a thread at Feministe, "negs" are only granted effectiveness because of vulnerabilities in women. It couldn't possibly be because some types of women actually enjoy some types of negs, without being psychologically broken!

I would go as far as to say that it is the least vulnerable women for whom negs are the most enjoyable and effective. Guys that lack the confidence , social savvy and resistance to moralizing pressure to display strong dominance in their approach are beneath them - and having a vulnerability for weaker approaches would lower their reproductive success and in general be far less powerful.