Yes unfortunately it still exists and will continue to do so because people mindset is deeply embedded with various religious thing from anceint time,that will make feel them superior over the other human beings, now why would anyone discard beliefs that will make them feel superior from the birth, right ?

Even whenever i meet or go to a friends house. First question would be what is your surname ? and i intentionally wont answer ,avoid and keep them puzzled. Just to piss them off :P

People from low caste are immune to discrimination, only if they're powerful n rich and if they're poor then would have to face lots of it.