The khawarij are not authorities to decide who committed kufr or not and what actions should be done in response..there are Islamic scholars and those in authority who will analyse that by due process and there are shariah way of correcting it if ur allegations of kufr has some truth in it. Not wearing a hijab and having a non hijabi girls poster on a street does not make one a kafir.
There is no asbaiyyah here. Its about people enforcing their own self styled cultural bedoin islam using the threat of gun, on another people who have their historical tradition of islam handed down to them through a chain of authorities.