PM, that is where the beauty of my country lies. The people have full freedom of expression and speech. We have a federal government and it makes the rulings about the casteism etc. But what verisi says is very correct the Casteism prevalent in some places are only for the sake of convenience and not to opress some group.
In India a group of people might think they are superior than others and they can propagate this feeling to it's fellow members. But they can't do it in Government organizations or use the Government facilities to propagate such thoughts. The Government respects the individual and his thoughts. And there is very less Moral Policing being done.
If you notice there is no segregation of caste in the mess. But there are seperate mess facilities for different castes, which is the choice of the populace in that place. The Government cannot intervene there. You know we are a real democracy! So the unification of mess, if it is to be done shall be proposed by the members and not enforced by the Government.