Khloé Kardashian is crying foul after a critic called her an "alien" on Twitter after the release of her latest Nurtec commercial.

A number of bashers have criticized the "Keeping Up with the Kardashians" star over and over because of her ever-changing looks. It was time to hit back.

"Sorry you feel that way," the 36-year-old star tells the Twitter troll who accused her of undergoing a series of plastic surgery. "You have every right to block/mute me. I am trying to help many out there who suffer in silence."

Kardashian understands her haters are entitled to their opinions but she can also say what she wants. She even attacks her critic's bio - stressing she shouldn't call herself feminist if she attacks an unprovoked woman.

The criticism began when the mother-of-one debuted another new look for her Nurtec commercial about a prescription medicine that treats migraines, PageSix noted.

"Does research indicate that the more plastic surgery someone has, the more likely they are to suffer from migraines?" the critic asks. "What kind of pharmaceutical company chooses someone who has had so much plastic surgery they look like an alien, as their spokesperson?"

Kardashian also responded to a backlash over her plastic water bottle comments on her Instagram stories.

She reveals her biggest peeve is seeing people pouring water from a plastic container into a reusable one.

Her critics remind Kardashian of all the plastic she used in the past, including the hundreds of balloon decorations she used at her parties. Surprised by the reaction, she says people are fond of turning "nothing into something."

She then confesses she is "learning and trying to be better for the environment for the sake of her daughter," True.

She tells people to buy a water filtration system instead of using single-use plastic bottles. The personality says she isn't about being perfect - but learning and making small changes for everyone's future.

She asks her followers to share tips on how they can be all environmentally friendly.