Fighting against untouchability

We still have untouchable cast i.e KAMI and DAMAI in my village area. So called higher cast in the society such as Bramin and Kshetriya never eat and drink anything prepared by them. They are even bound to sit outside when they visit to Bramin and Kshetriya cast's home. In other words, They are not allowed to enter inside the home which shows not only extreme discrimination but also inhumanity. My grandfather used to tell me that I shouldnot eat anything served by them as deity would not accept it. As a result, Something displeasing would happen. But now I dared to eat with them to give a massage to the society that we all are same human being.