Why lovers ar not understandng their parents situation when they explain about inter-caste marriage?

The whole idea of castes is an anachronism that has no place in the 21st century. It is a means of oppressing whole groups of people while promoting social segregation. Young people are starting to see that, and it's about time.Why lovers ar not understandng their parents situation when they explain about inter-caste marriage?It is matter of difference experiences ..better is to look for intermediate person to explain..