Wonder how Kim Kardashian feels about this?

Just two days after Kim, 29, twittered "EWW!" when she saw a woman breastfeeding in public, her sister, Kourtney, 31, openly pumped breast milk on Sunday's Kourtney and Khloe Take Miami. (On the same episode, Kourtney also gave Khloe, 25, a bikini wax.)

"I guess it is OK for us to watch Kourtney pump her breasts on the show, wax her sister... and wipe herself after using the toilet," fumed Samantha, one of the 500+ commenters on UsMagazine.com.

Another commenter wrote, "You should be ashamed of yourself, Kim. You could choose to be a leader and an advocate for women instead of attacking them. You disgust me."

Kim tried to defend her position later Saturday. "The woman had her boobs out at restaurant yest. feeding, then laid her on table and changed her w the food there. Unsanitary... My sister breast feeds! Its a natural beautiful thing, there's nothing wrong w it, but she covers herself, not w her boobs exposed."

(Khloe has joked that Kourtney "whips her boobs out" all the time and even "tasted her own breast milk.")

PHOTOS: See the Kardashian family album

Added Kim on Twitter, "And you DON'T change a dirty at the dinner table...u use the restroom. Everyone was complaining! Just unsanitary."

Tell Us: Do the Kardashians have a double standard?