Breast is best; breast is good. I don't find the act of mammalian breast-feeding in the least offensive - whether a cow suckling her calf or a cat suckling her kitts, it's an natural as Sunlight. I was brought up on the sight of bare-breasted African native girls suckling their picaninnies - and in one case, thanks to Armand Denis, suckling an orphaned gorilla. And on occasion, when baby absolutely won't wait, I've been in the same room / train / north sea ferry as an unknown European woman discreetly feeding her infant as everyone helpfully averted their gaze. I have no problems with any of it.
What I do have a problem with is women using their babies in public places as aggressive tools with which to seek to shame or embarrass other persons present in a jejune and rather silly political gesture. It's not a matter of feminism - it's a matter of coarseness, foul manners and vulgarity. Such women should be treated as what they plainly are - lewd, coarse, vulgar and, for their child-abuse, beneath contempt.