Discrimination is necessary in all walks. Tamil people like to move around with Tamil people, so do the marathis and others.
Architects like to move around with other architects because they can relate to them more.
Doctors like to move around with doctors.
People of one religion want to live with people of the same religion. This is not negative discrimiation, but a positive one. People want to live with their own kind and grow their culture.
Intermingling means compromising on your cultural uniqueness. Healthy discrimination enriches diversity.
Vegetarians need not suffer when put along with nonvegetarians. they can move along with other vegetarians and prepare delicious vegetarian meals.
Discrimination is a healthy practise. Positive discrimination leads to growth and development. Positive discrimination leads to happiness.